v3.19.3.a.u2
Pension And Other Postretirement Benefits (Assets Recorded In Balance Sheet And Other Comprehensive Income) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Postretirement benefits reserves $ (22,304) $ (20,272)
U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at December 31 [1] (7,323) (7,040)
Current liabilities (242) (243)
Postretirement benefits reserves (7,081) (6,797)
Total recorded [1] (7,323) (7,040)
Net actuarial loss/(gain) 3,971 3,831
Prior service cost 1 6
Total recorded in accumulated other comprehensive income 3,972 3,837
Pension Benefits - Non-U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at December 31 [1] (7,002) (5,892)
Other assets 1,151 1,174
Current liabilities (267) (314)
Postretirement benefits reserves (7,886) (6,752)
Total recorded [1] (7,002) (5,892)
Net actuarial loss/(gain) 5,662 4,713
Prior service cost 360 (93)
Total recorded in accumulated other comprehensive income 6,022 4,620
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Balance at December 31 [1] (7,688) (7,085)
Current liabilities (351) (362)
Postretirement benefits reserves (7,337) (6,723)
Total recorded [1] (7,688) (7,085)
Net actuarial loss/(gain) 1,339 877
Prior service cost (315) (357)
Total recorded in accumulated other comprehensive income $ 1,024 $ 520
[1] Fair value of assets less benefit obligation shown on the preceding page.