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Fair Value of Financial Instruments - Reconciliation of Level 3 Financial Instruments (Details) - Level 3 - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 39 $ 4
Total (losses) gains— realized/unrealized included in earnings (10) 11
Cash received (1)  
Purchases (2) 1
Transfers into Level 3 17 4
Transfers out of Level 3 (27) 4
Ending balance 16 24
(Losses) Gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held (12) 12
Debt Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 19 19
Total (losses) gains— realized/unrealized included in earnings 0 0
Cash received (1)  
Purchases 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending balance 18 19
(Losses) Gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held 0 0
Derivatives    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 20 (15)
Total (losses) gains— realized/unrealized included in earnings (10) 11
Cash received 0  
Purchases (2) 1
Transfers into Level 3 17 4
Transfers out of Level 3 (27) 4
Ending balance (2) 5
(Losses) Gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held $ (12) $ 12