v3.19.3.a.u2
Pension And Other Postretirement Benefits (Change In Plan Assets Of Pension And Other Postretirement Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at January 1 $ 11,134 $ 12,782
Actual return on plan assets 2,521 (710)
Company contribution 1,022 491
Benefits paid [1] (1,041) (1,429)
Fair value at December 31 13,636 11,134
Pension Benefits - Non-U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at January 1 19,486 21,461
Actual return on plan assets 3,210 (15)
Foreign exchange rate changes 513 (1,320)
Company contribution 602 438
Benefits paid [1] (883) (903)
Other (12) (175)
Fair value at December 31 22,916 19,486
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value at January 1 386 427
Actual return on plan assets 54 (13)
Company contribution 41 30
Benefits paid [1] (56) (58)
Fair value at December 31 $ 425 $ 386
[1] Benefit payments for funded plans.