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Reserve for Life-Contingent Contract Benefits and Contractholder Funds - Variable annuity contracts with guarantees (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 $ 2,470 $ 3,020
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 2,711 3,344
Net amount at risk $ 605 $ 454
Average attained age of contractholders 71 years 70 years
At annuitization (includes income benefit guarantees)    
Variable annuity contracts with guarantees    
Separate account value $ 778 $ 944
Net amount at risk 264 202
For cumulative periodic withdrawals    
Variable annuity contracts with guarantees    
Separate account value 190 253
Net amount at risk 16 10
Accumulation at specified dates    
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