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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 46 $ 57 $ 92 $ 114
Interest cost 57 54 114 108
Expected return on plan assets (73) (73) (145) (146)
Amortization of unrecognized (gain) loss 29 32 58 65
Amortization of prior service credit 0 0 0 0
Settlement loss 3 0 3 0
Total 62 70 122 141
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 3 3 5 6
Interest cost 14 15 29 30
Expected return on plan assets (1) 0 (1) 0
Amortization of unrecognized (gain) loss (15) (8) (30) (16)
Amortization of prior service credit (9) (10) (19) (19)
Settlement loss 0 0 0 0
Total $ (8) $ 0 $ (16) $ 1