v3.25.4
Pension and Postretirement Benefit Plans and Defined Contribution Plans - Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Postretirement Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 814 $ 736 $ 636
U.S. [Member] | Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 10,124 9,948 10,935
U.S. [Member] | Pension Plans [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 100.00%    
U.S. [Member] | Pension Plans [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,466 1,401  
U.S. [Member] | Pension Plans [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5,591 5,518  
U.S. [Member] | Pension Plans [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. [Member] | Pension Plans [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 3,066 3,028  
U.S. [Member] | Pension Plans [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 682 533  
U.S. [Member] | Pension Plans [Member] | Cash and cash equivalents [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 0.00%    
U.S. [Member] | Pension Plans [Member] | Cash and cash equivalents [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 66 56  
U.S. [Member] | Pension Plans [Member] | Cash and cash equivalents [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 615 477  
U.S. [Member] | Pension Plans [Member] | Cash and cash equivalents [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. [Member] | Pension Plans [Member] | Cash and cash equivalents [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] $ 0 0  
U.S. [Member] | Pension Plans [Member] | Equity securities [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 10.00%    
U.S. [Member] | Pension Plans [Member] | Global equity securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,396 1,341  
U.S. [Member] | Pension Plans [Member] | Global equity securities [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,396 1,341  
U.S. [Member] | Pension Plans [Member] | Global equity securities [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
U.S. [Member] | Pension Plans [Member] | Global equity securities [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. [Member] | Pension Plans [Member] | Global equity securities [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 0 0  
U.S. [Member] | Pension Plans [Member] | Equity commingled funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 216 97  
U.S. [Member] | Pension Plans [Member] | Equity commingled funds [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. [Member] | Pension Plans [Member] | Equity commingled funds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 216 97  
U.S. [Member] | Pension Plans [Member] | Equity commingled funds [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. [Member] | Pension Plans [Member] | Equity commingled funds [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] $ 0 0  
U.S. [Member] | Pension Plans [Member] | Fixed income securities [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 45.00%    
U.S. [Member] | Pension Plans [Member] | Corporate debt [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 2,660 2,878  
U.S. [Member] | Pension Plans [Member] | Corporate debt [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4 4  
U.S. [Member] | Pension Plans [Member] | Corporate debt [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,656 2,874  
U.S. [Member] | Pension Plans [Member] | Corporate debt [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
U.S. [Member] | Pension Plans [Member] | Corporate debt [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 0    
U.S. [Member] | Pension Plans [Member] | Government and agency obligations [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 2,090 2,059  
U.S. [Member] | Pension Plans [Member] | Government and agency obligations [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 0 0  
U.S. [Member] | Pension Plans [Member] | Government and agency obligations [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 2,090 2,059  
U.S. [Member] | Pension Plans [Member] | Government and agency obligations [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 0 0  
U.S. [Member] | Pension Plans [Member] | Government and agency obligations [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1],[2] 0 0  
U.S. [Member] | Pension Plans [Member] | Fixed income commingled funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 43 42  
U.S. [Member] | Pension Plans [Member] | Fixed income commingled funds [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
U.S. [Member] | Pension Plans [Member] | Fixed income commingled funds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13 12  
U.S. [Member] | Pension Plans [Member] | Fixed income commingled funds [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. [Member] | Pension Plans [Member] | Fixed income commingled funds [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] $ 30 30  
U.S. [Member] | Pension Plans [Member] | Other investments [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 10.00%    
U.S. [Member] | Pension Plans [Member] | Partnership Interest [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] $ 2,735 2,665  
U.S. [Member] | Pension Plans [Member] | Partnership Interest [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 0 0  
U.S. [Member] | Pension Plans [Member] | Partnership Interest [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3]   0  
U.S. [Member] | Pension Plans [Member] | Partnership Interest [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 0 0  
U.S. [Member] | Pension Plans [Member] | Partnership Interest [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1],[3] 2,735 2,665  
U.S. [Member] | Pension Plans [Member] | Insurance contracts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. [Member] | Pension Plans [Member] | Insurance contracts [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. [Member] | Pension Plans [Member] | Insurance contracts [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
U.S. [Member] | Pension Plans [Member] | Insurance contracts [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
U.S. [Member] | Pension Plans [Member] | Insurance contracts [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 0 0  
U.S. [Member] | Pension Plans [Member] | Other commingled funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 302 333  
U.S. [Member] | Pension Plans [Member] | Other commingled funds [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 0 0  
U.S. [Member] | Pension Plans [Member] | Other commingled funds [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 0 0  
U.S. [Member] | Pension Plans [Member] | Other commingled funds [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1],[4] 302 333  
U.S. [Member] | Postretirement Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 814 736  
U.S. [Member] | Postretirement Plans [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 100.00%    
U.S. [Member] | Postretirement Plans [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0    
U.S. [Member] | Postretirement Plans [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 814 736  
U.S. [Member] | Postretirement Plans [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
U.S. [Member] | Postretirement Plans [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1]   0  
U.S. [Member] | Postretirement Plans [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] $ 10 12  
U.S. [Member] | Postretirement Plans [Member] | Cash and cash equivalents [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 0.00%    
U.S. [Member] | Postretirement Plans [Member] | Cash and cash equivalents [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] $ 0    
U.S. [Member] | Postretirement Plans [Member] | Cash and cash equivalents [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] 10 12  
U.S. [Member] | Postretirement Plans [Member] | Cash and cash equivalents [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5]   0  
U.S. [Member] | Postretirement Plans [Member] | Cash and cash equivalents [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1],[5]   0  
U.S. [Member] | Postretirement Plans [Member] | Insurance contracts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] $ 804 724  
U.S. [Member] | Postretirement Plans [Member] | Insurance contracts [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 95.00%    
U.S. [Member] | Postretirement Plans [Member] | Insurance contracts [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] $ 0    
U.S. [Member] | Postretirement Plans [Member] | Insurance contracts [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5] 804 724  
U.S. [Member] | Postretirement Plans [Member] | Insurance contracts [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [5]   0  
U.S. [Member] | Postretirement Plans [Member] | Insurance contracts [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1],[5]   0  
International [Member] | Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 6,606 6,696 6,552
International [Member] | Pension Plans [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 100.00%    
International [Member] | Pension Plans [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 123 174  
International [Member] | Pension Plans [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,763 3,642  
International [Member] | Pension Plans [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,256 1,433 $ 1,340
International [Member] | Pension Plans [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 1,464 1,447  
International [Member] | Pension Plans [Member] | Cash and cash equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 346 310  
International [Member] | Pension Plans [Member] | Cash and cash equivalents [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 0.00%    
International [Member] | Pension Plans [Member] | Cash and cash equivalents [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 108 138  
International [Member] | Pension Plans [Member] | Cash and cash equivalents [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 237 172  
International [Member] | Pension Plans [Member] | Cash and cash equivalents [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International [Member] | Pension Plans [Member] | Cash and cash equivalents [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] $ 0 0  
International [Member] | Pension Plans [Member] | Equity securities [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 10.00%    
International [Member] | Pension Plans [Member] | Equity commingled funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 714 704  
International [Member] | Pension Plans [Member] | Equity commingled funds [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International [Member] | Pension Plans [Member] | Equity commingled funds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 686 619  
International [Member] | Pension Plans [Member] | Equity commingled funds [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International [Member] | Pension Plans [Member] | Equity commingled funds [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] $ 28 86  
International [Member] | Pension Plans [Member] | Fixed income securities [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 45.00%    
International [Member] | Pension Plans [Member] | Corporate debt [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 347 638  
International [Member] | Pension Plans [Member] | Corporate debt [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International [Member] | Pension Plans [Member] | Corporate debt [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 342 633  
International [Member] | Pension Plans [Member] | Corporate debt [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5 5  
International [Member] | Pension Plans [Member] | Corporate debt [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 0 0  
International [Member] | Pension Plans [Member] | Government and agency obligations [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 1,041 960  
International [Member] | Pension Plans [Member] | Government and agency obligations [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 0 1  
International [Member] | Pension Plans [Member] | Government and agency obligations [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 1,041 960  
International [Member] | Pension Plans [Member] | Government and agency obligations [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [2] 0 0  
International [Member] | Pension Plans [Member] | Government and agency obligations [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1],[2] 0 0  
International [Member] | Pension Plans [Member] | Fixed income commingled funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,773 1,750  
International [Member] | Pension Plans [Member] | Fixed income commingled funds [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International [Member] | Pension Plans [Member] | Fixed income commingled funds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,225 1,064  
International [Member] | Pension Plans [Member] | Fixed income commingled funds [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International [Member] | Pension Plans [Member] | Fixed income commingled funds [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] $ 548 686  
International [Member] | Pension Plans [Member] | Other investments [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Equity and debt securities, target allocation percentage 20.00%    
International [Member] | Pension Plans [Member] | Partnership Interest [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] $ 148 147  
International [Member] | Pension Plans [Member] | Partnership Interest [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 0 0  
International [Member] | Pension Plans [Member] | Partnership Interest [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 2 2  
International [Member] | Pension Plans [Member] | Partnership Interest [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [3] 0 0  
International [Member] | Pension Plans [Member] | Partnership Interest [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1],[3] 146 145  
International [Member] | Pension Plans [Member] | Insurance contracts [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,033 1,221  
International [Member] | Pension Plans [Member] | Insurance contracts [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
International [Member] | Pension Plans [Member] | Insurance contracts [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 46 45  
International [Member] | Pension Plans [Member] | Insurance contracts [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 988 1,176  
International [Member] | Pension Plans [Member] | Insurance contracts [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1] 0 0  
International [Member] | Pension Plans [Member] | Other [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 1,204 965  
International [Member] | Pension Plans [Member] | Other [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 14 35  
International [Member] | Pension Plans [Member] | Other [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 185 147  
International [Member] | Pension Plans [Member] | Other [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [4] 263 252  
International [Member] | Pension Plans [Member] | Other [Member] | Assets Measured at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets [1],[4] $ 741 $ 531  
[1] Certain investments that are measured at NAV per share (or its equivalent) have not been classified in the fair value hierarchy. The NAV amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented for the total pension benefits plan assets.
[2] Government and agency obligations are inclusive of repurchase agreements.
[3] Mainly includes investments in private equity, private debt and real estate.
[4] Mostly includes investments in hedge funds, real estate and infrastructure.
[5] Reflects postretirement plan assets, which support our U.S. retiree medical plans.