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Employee Benefit Plans - Net Periodic Benefits Cost and Other Recognized in the OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits      
Defined Benefit Plan, Net Periodic Cost (Benefit)      
Service cost $ 4 $ 4 $ 2
Interest cost 142 170 237
Expected return on plan assets (227) (267) (311)
Amortization of actuarial loss 49 56 56
Settlements 0 750  
Net periodic cost (benefit) (32) 713 (16)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)      
Amortization of actuarial loss 49 56 56
Settlement loss 0 750 0
Amortization of prior service credit 0 0 0
Net loss arising during the year (91) (209) (66)
Total (42) 597 (10)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net loss (2,008) (1,966) (2,563)
Prior service credit 0 0 0
Total (2,008) (1,966) (2,563)
Other Postretirement Benefits      
Defined Benefit Plan, Net Periodic Cost (Benefit)      
Service cost 0 0  
Interest cost 7 8 11
Expected return on plan assets (7) (8) (10)
Amortization of prior service credit (7) (7) (6)
Amortization of actuarial loss 6 5 5
Settlements   0  
Net periodic cost (benefit) (1) (2) 0
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss)      
Amortization of actuarial loss 6 5 5
Settlement loss 0 0 0
Amortization of prior service credit (6) (7) (6)
Net loss arising during the year 3 (12) (4)
Total 3 (14) (5)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]      
Net loss (120) (129) (122)
Prior service credit 72 78 85
Total $ (48) $ (51) $ (37)