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Reserve for Life-Contingent Contract Benefits and Contractholder Funds - Variable annuity contracts with guarantees and other (Details) - Variable annuities - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Variable annuity contracts with guarantees    
Account balances of separate accounts with guarantees, invested in equity, fixed income and balanced mutual funds $ 2,660 $ 2,450
Account balances of separate accounts with guarantees, invested in money market mutual funds 252 245
In the event of death    
Variable annuity contracts with guarantees    
Separate account value 2,908 2,694
Net amount at risk $ 373 $ 605
Average attained age of contractholders 71 years 71 years
Liability for guarantees related to income benefits    
Variable annuity contracts with guarantees    
Separate account value $ 848 $ 778
Net amount at risk $ 173 $ 264
Weighted average waiting period until guarantee date 0 years 0 years
For cumulative periodic withdrawals    
Variable annuity contracts with guarantees    
Separate account value $ 190 $ 190
Net amount at risk 13 16
Guaranteed accumulation benefits    
Variable annuity contracts with guarantees    
Separate account value 123 129
Net amount at risk $ 15 $ 26
Weighted average waiting period until guarantee date 4 years 4 years