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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, 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 $ 2,680 $ 2,470
Account balances of separate accounts with guarantees, invested in money market mutual funds 253 245
In the event of death    
Variable annuity contracts with guarantees    
Separate account value 2,928 2,711
Net amount at risk $ 373 $ 605
Average attained age of contractholders 71 years 71 years
At annuitization (includes income benefit guarantees)    
Variable annuity contracts with guarantees    
Separate account value $ 848 $ 778
Net amount at risk 173 264
For cumulative periodic withdrawals    
Variable annuity contracts with guarantees    
Separate account value 190 190
Net amount at risk 13 16
Accumulation at specified dates    
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