v3.19.3.a.u2
Pension And Other Postretirement Benefits (Long-Term Rates Of Pension And Other Postretirement Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Total recorded in other comprehensive income $ 2,041 $ (1,657) $ (1,279)
U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.40% 3.80% 4.25%
Long-term rate of return on funded assets 5.30% 6.00% 6.50%
Long-term rate of compensation increase 5.75% 5.75% 5.75%
Service cost $ 757 $ 819 $ 784
Interest cost 766 721 798
Expected return on plan assets (568) (727) (775)
Amortization of actuarial loss/(gain) 305 362 438
Amortization of prior service cost 5 5 5
Net pension enhancement and curtailment/settlement cost 164 268 609
Net periodic benefit cost 1,429 1,448 1,859
Net actuarial loss/(gain) 609 479 (324)
Amortization of actuarial (loss)/gain (469) (630) (1,047)
Amortization of prior service (cost)/credit (5) (5) (5)
Total recorded in other comprehensive income 135 (156) (1,376)
Total recorded in net periodic benefit cost and other comprehensive income, before tax $ 1,564 $ 1,292 $ 483
Pension Benefits - Non-U.S. [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 3.00% 2.80% 3.00%
Long-term rate of return on funded assets 4.10% 4.70% 5.20%
Long-term rate of compensation increase 4.30% 4.30% 4.00%
Service cost $ 551 $ 608 $ 596
Interest cost 763 754 772
Expected return on plan assets (777) (951) (1,000)
Amortization of actuarial loss/(gain) 306 409 476
Amortization of prior service cost 56 46 47
Net pension enhancement and curtailment/settlement cost (98) 44 19
Net periodic benefit cost 801 910 910
Net actuarial loss/(gain) 1,268 (66) (191)
Amortization of actuarial (loss)/gain (208) (453) (495)
Prior service cost/(credit) 379 98 111
Amortization of prior service (cost)/credit (56) (46) (47)
Foreign exchange rate changes 19 (356) 559
Total recorded in other comprehensive income 1,402 (823) (63)
Total recorded in net periodic benefit cost and other comprehensive income, before tax $ 2,203 $ 87 $ 847
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.40% 3.80% 4.25%
Long-term rate of return on funded assets 4.60% 6.00% 6.50%
Long-term rate of compensation increase 5.75% 5.75% 5.75%
Service cost $ 139 $ 152 $ 129
Interest cost 315 301 317
Expected return on plan assets (15) (23) (24)
Amortization of actuarial loss/(gain) 55 116 96
Amortization of prior service cost (42) (40) (33)
Net periodic benefit cost 452 506 485
Net actuarial loss/(gain) 517 (594) 215
Amortization of actuarial (loss)/gain (55) (116) (96)
Amortization of prior service (cost)/credit 42 40 33
Foreign exchange rate changes   (8) 8
Total recorded in other comprehensive income 504 (678) 160
Total recorded in net periodic benefit cost and other comprehensive income, before tax $ 956 $ (172) $ 645