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MRBs (Summary of Balances of Changes in Net MRB (Assets) Liabilities) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Market Risk Benefit [Line Items]    
Balance as of beginning-of-year $ (729)  
Balance as of end-of-period (1,469) $ (729)
Variable Annuities [Member]    
Market Risk Benefit [Line Items]    
Balance as of beginning-of-year (662) 2,398
Balance as of beginning-of-year, before the effect of changes in non-performance risk 1,511 4,823
Issuances 1 12
Attributed fees collected 379 1,571
Benefit payments (19) (63)
Effect of changes in interest rates 1,406 (9,346)
Effect of changes in equity markets (1,029) 4,293
Effect of changes in equity index volatility (286) (225)
In-force updates and other changes in MRBs 76 661
Actual policyholder behavior different from expected behavior   (158)
Effect of changes in future expected assumptions   (57)
Balance as of end-of-year, before the effect of changes in non-performance risk 2,039 1,511
Effect of changes in non-performance risk (3,451) (2,173)
Balance as of end-of-period (1,412) (662)
Less: ceded MRB assets (liabilities) (246) (193)
Balance as of end-of-period, net of reinsurance $ (1,166) $ (469)
Weighted-average age of policyholders (years) 71 years 71 years
Net amount at risk $ 6,268 $ 7,974
Fixed Annuities [Member]    
Market Risk Benefit [Line Items]    
Balance as of beginning-of-year (45) 114
Balance as of beginning-of-year, before the effect of changes in non-performance risk (5) 158
Attributed fees collected 9 32
Effect of changes in interest rates 31 (232)
Effect of changes in equity markets (2) 12
Effect of changes in equity index volatility   14
In-force updates and other changes in MRBs 1 10
Actual policyholder behavior different from expected behavior   1
Balance as of end-of-year, before the effect of changes in non-performance risk 34 (5)
Effect of changes in non-performance risk (65) (40)
Balance as of end-of-period (31) (45)
Balance as of end-of-period, net of reinsurance $ (31) $ (45)
Weighted-average age of policyholders (years) 68 years 68 years
Net amount at risk $ 192 $ 171
Retirement Plan Services [Member]    
Market Risk Benefit [Line Items]    
Balance as of beginning-of-year (22) (1)
Balance as of beginning-of-year, before the effect of changes in non-performance risk (20) 12
Issuances   (3)
Attributed fees collected 2 6
Effect of changes in interest rates 5 (55)
Effect of changes in equity markets (6) 18
Effect of changes in equity index volatility (2) (1)
In-force updates and other changes in MRBs   3
Balance as of end-of-year, before the effect of changes in non-performance risk (21) (20)
Effect of changes in non-performance risk (5) (2)
Balance as of end-of-period (26) (22)
Balance as of end-of-period, net of reinsurance $ (26) $ (22)
Weighted-average age of policyholders (years) 63 years 63 years
Net amount at risk $ 9 $ 15