v3.25.4
Pension and Other Postretirement Benefit Plans - Summary of Changes in Fair Value of Company's Level 3 Pension Plan Assets (Details) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 $ 700  
Actual return on plan assets:    
Fair value of plan assets December 31 737 $ 700
United States    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 9,717 9,804
Actual return on plan assets:    
Fair value of plan assets December 31 10,730 9,717
United States | Other    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 2  
Actual return on plan assets:    
Fair value of plan assets December 31 2 2
United States | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 2 3
Actual return on plan assets:    
Relating to assets still held at December 31 0 (2)
Relating to assets sold during the year 0 2
Purchases and sales, net 0 (1)
Fair value of plan assets December 31 2 2
United States | Level 3 | Insurance Contracts    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 0 0
Actual return on plan assets:    
Relating to assets still held at December 31 0 0
Relating to assets sold during the year 0 0
Purchases and sales, net 0 0
Fair value of plan assets December 31 0 0
United States | Level 3 | Other    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 2 3
Actual return on plan assets:    
Relating to assets still held at December 31 0 (2)
Relating to assets sold during the year 0 2
Purchases and sales, net 0 (1)
Fair value of plan assets December 31 2 2
International    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 9,647 9,562
Actual return on plan assets:    
Fair value of plan assets December 31 10,906 9,647
International | Insurance Contracts    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 701  
Actual return on plan assets:    
Fair value of plan assets December 31 735 701
International | Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 698 785
Actual return on plan assets:    
Relating to assets still held at December 31 117 (26)
Purchases and sales, net (85) (61)
Transfers into Level 3 5 0
Fair value of plan assets December 31 735 698
International | Level 3 | Insurance Contracts    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 698 785
Actual return on plan assets:    
Relating to assets still held at December 31 117 (26)
Purchases and sales, net (85) (61)
Transfers into Level 3 5 0
Fair value of plan assets December 31 735 698
International | Level 3 | Other    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets January 1 0 0
Actual return on plan assets:    
Relating to assets still held at December 31 0 0
Purchases and sales, net 0 0
Transfers into Level 3 0 0
Fair value of plan assets December 31 $ 0 $ 0