Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
Employee Benefit Plans - Pretax Amounts Recognized in OCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) $ 679 $ (207)
Amortization of actuarial gain (loss) and prior service cost (171) (175)
Current year prior service cost (credit) 13 (23)
Amounts recognized in OCI 521 (405)
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) (73) (7)
Amortization of actuarial gain (loss) and prior service cost 30 21
Current year prior service cost (credit) 0 (23)
Amounts recognized in OCI (43) (9)
Non-U.S. | Pension Plan    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) 270 (12)
Amortization of actuarial gain (loss) and prior service cost (11) (8)
Current year prior service cost (credit) 13 0
Amounts recognized in OCI 272 (20)
Qualified | U.S. | Pension Plan    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) 541 (283)
Amortization of actuarial gain (loss) and prior service cost (147) (154)
Current year prior service cost (credit) 0 0
Amounts recognized in OCI 394 (437)
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) (59) 95
Amortization of actuarial gain (loss) and prior service cost (43) (34)
Current year prior service cost (credit) 0 0
Amounts recognized in OCI $ (102) $ 61