Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Pretax Amounts Recognized in OCI (Details)

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Employee Benefit Plans - Pretax Amounts Recognized in OCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) $ (46) $ 679
Amortization of actuarial gain (loss) and prior service cost (150) (171)
Current year prior service cost (credit) 2 13
Amounts recognized in OCI (194) 521
U.S. | Postretirement Health and Life Plans    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) 99 (73)
Amortization of actuarial gain (loss) and prior service cost 26 30
Current year prior service cost (credit) 0 0
Amounts recognized in OCI 125 (43)
Non-U.S. | Pension Plan    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) 110 270
Amortization of actuarial gain (loss) and prior service cost (7) (11)
Current year prior service cost (credit) 2 13
Amounts recognized in OCI 105 272
Qualified | U.S. | Pension Plan    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) (385) 541
Amortization of actuarial gain (loss) and prior service cost (135) (147)
Current year prior service cost (credit) 0 0
Amounts recognized in OCI (520) 394
Nonqualified | U.S. | Other Pension Plan    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) 130 (59)
Amortization of actuarial gain (loss) and prior service cost (34) (43)
Current year prior service cost (credit) 0 0
Amounts recognized in OCI $ 96 $ (102)