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Derivatives - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
swap
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
swap
Sep. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]              
Carrying value of collateral received to support purchased call options $ 472     $ 472     $ 103
Total realized/unrealized gains (losses) included in net income for the embedded derivatives related to unlocking of actuarial assumptions $ 181   $ (44)        
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps              
Derivative Instruments, Gain (Loss) [Line Items]              
Number of interest rate swaps designated and qualifying as a cash flow hedges | swap 14     14      
Derivative, notional amount $ 2,110     $ 2,110     2,350
Gain (loss) reclassified from AOCI into net investment income   $ (1)   (1) $ (2)    
Collateral receivable supporting interest rate swaps 19     19     135
Other assets | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps              
Derivative Instruments, Gain (Loss) [Line Items]              
Net derivatives, at fair value 69     69     16
Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps              
Derivative Instruments, Gain (Loss) [Line Items]              
Net derivatives, at fair value             $ (46)
Contract termination | Cash Flow Hedges | Interest rate swaps              
Derivative Instruments, Gain (Loss) [Line Items]              
Derivative, notional amount 78     78   $ 138  
Maximum | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain (loss) reclassified from AOCI into net investment income (1)            
Maximum | Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swaps              
Derivative Instruments, Gain (Loss) [Line Items]              
Net derivatives, at fair value $ (1)     $ (1)