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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, 2018
Dec. 31, 2017
Variable annuity contracts with guarantees    
Account balances of separate accounts with guarantees, invested in equity, fixed income and balanced mutual funds $ 2,450 $ 3,000
Account balances of separate accounts with guarantees, invested in money market mutual funds 245 322
In the event of death    
Variable annuity contracts with guarantees    
Separate account value 2,694 3,323
Net amount at risk $ 605 $ 453
Average attained age of contractholders 71 years 70 years
Liability for guarantees related to income benefits    
Variable annuity contracts with guarantees    
Separate account value $ 778 $ 944
Net amount at risk $ 264 $ 202
Weighted average waiting period until guarantee date 0 years 0 years
For cumulative periodic withdrawals    
Variable annuity contracts with guarantees    
Separate account value $ 190 $ 253
Net amount at risk 16 10
Guaranteed accumulation benefits    
Variable annuity contracts with guarantees    
Separate account value 129 170
Net amount at risk $ 26 $ 17
Weighted average waiting period until guarantee date 4 years 5 years