Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Employee Benefit Plans - Pretax Amounts Recognized in OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) $ 374 $ (46)
Amortization of actuarial gain (loss) and prior service cost (262) (150)
Current year prior service cost (credit) 3 2
Amounts recognized in OCI 115 (194)
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) 47 99
Amortization of actuarial gain (loss) and prior service cost (27) 26
Current year prior service cost (credit) 0 0
Amounts recognized in OCI 20 125
Non-U.S. | Pension Plan    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) 79 110
Amortization of actuarial gain (loss) and prior service cost (12) (7)
Current year prior service cost (credit) 3 2
Amounts recognized in OCI 70 105
Qualified | U.S. | Pension Plan    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) 219 (385)
Amortization of actuarial gain (loss) and prior service cost (173) (135)
Current year prior service cost (credit) 0 0
Amounts recognized in OCI 46 (520)
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) 29 130
Amortization of actuarial gain (loss) and prior service cost (50) (34)
Current year prior service cost (credit) 0 0
Amounts recognized in OCI $ (21) $ 96