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Fair Value of Financial Instruments - Reconciliation of Level 3 Financial Instruments (Details) - Level 3 - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 16 $ 24 $ 39 $ 4
Contracts added from acquisitions (1) 12 (1) 12
Total gains (losses) — realized/unrealized included in earnings (16) (27) (26) (16)
Cash received 0   (1)  
Purchases (10) (4) (12) (3)
Transfers into Level 3 113 193 130 197
Transfers out of Level 3 14 (5) (13) (1)
Ending balance 116 193 116 193
Gains (Losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held (18) (27) (30) (15)
Debt Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 18 19 19 19
Contracts added from acquisitions 0 0 0 0
Total gains (losses) — realized/unrealized included in earnings 1 0 1 0
Cash received 0   (1)  
Purchases 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 19 19 19 19
Gains (Losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held 1 0 1 0
Derivatives        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance (2) 5 20 (15)
Contracts added from acquisitions (1) 12 (1) 12
Total gains (losses) — realized/unrealized included in earnings (17) (27) (27) (16)
Cash received 0   0  
Purchases (10) (4) (12) (3)
Transfers into Level 3 113 193 130 197
Transfers out of Level 3 14 (5) (13) (1)
Ending balance 97 174 97 174
Gains (Losses) for the period included in earnings attributable to the change in unrealized gains or losses relating to assets or liabilities still held $ (19) $ (27) $ (31) $ (15)