Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Employee Benefit Plans - Pretax Amounts Recognized in OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) $ (207) $ 906
Amortization of actuarial gain (loss) (175) (92)
Current year prior service cost (credit) (19) 0
Amortization of prior service cost (4) (5)
Amounts recognized in OCI (405) 809
Amounts amortized from accumulated OCI 176  
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) (7) 25
Amortization of actuarial gain (loss) 21 81
Current year prior service cost (credit) (19) 0
Amortization of prior service cost (4) (4)
Amounts recognized in OCI (9) 102
Non-U.S. | Pension Plan    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) (12) 100
Amortization of actuarial gain (loss) (8) (6)
Current year prior service cost (credit) 0 0
Amortization of prior service cost 0 (1)
Amounts recognized in OCI (20) 93
Qualified | U.S. | Pension Plan    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax [Abstract]    
Current year actuarial loss (gain) (283) 648
Amortization of actuarial gain (loss) (154) (139)
Current year prior service cost (credit) 0 0
Amortization of prior service cost 0 0
Amounts recognized in OCI (437) 509
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) 95 133
Amortization of actuarial gain (loss) (34) (28)
Current year prior service cost (credit) 0 0
Amortization of prior service cost 0 0
Amounts recognized in OCI $ 61 $ 105