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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, 2020
Dec. 31, 2019
Variable annuity contracts with guarantees    
Account balances of separate accounts with guarantees, invested in equity, fixed income and balanced mutual funds $ 2,960 $ 2,680
Account balances of separate accounts with guarantees, invested in money market mutual funds 238 253
In the event of death    
Variable annuity contracts with guarantees    
Separate account value 3,197 2,928
Net amount at risk $ 308 $ 373
Weighted average attained age 72 years 71 years
At annuitization (includes income benefit guarantees)    
Variable annuity contracts with guarantees    
Separate account value $ 925 $ 848
Net amount at risk 140 173
For cumulative periodic withdrawals    
Variable annuity contracts with guarantees    
Separate account value 178 190
Net amount at risk 12 13
Accumulation at specified dates    
Variable annuity contracts with guarantees    
Separate account value 93 123
Net amount at risk $ 11 $ 15
Weighted average waiting period until guarantee date 3 years 4 years