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Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period $ (5,246) $ (6,106)
OCI before reclassifications (246) 972
Deferred income tax benefit (expense) (3) 51 (204)
AOCI before reclassifications, net of income tax (5,441) (5,338)
Amounts reclassified from AOCI 34 64
Deferred income tax benefit (expense) (3) (6) (14)
Amounts reclassified from AOCI, net of income tax 28 50
Balance, end of period (5,413) (5,288)
Unrealized Investment Gains (Losses), Net of Related Offsets (1)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period (4,317) (6,194)
OCI before reclassifications (820) 1,414
Deferred income tax benefit (expense) (3) 171 (296)
AOCI before reclassifications, net of income tax (4,966) (5,076)
Amounts reclassified from AOCI 36 61
Deferred income tax benefit (expense) (3) (7) (13)
Amounts reclassified from AOCI, net of income tax 29 48
Balance, end of period (4,937) (5,028)
Unrealized Gains (Losses) on Derivatives    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period 277 504
OCI before reclassifications 53 (40)
Deferred income tax benefit (expense) (3) (11) 8
AOCI before reclassifications, net of income tax 319 472
Amounts reclassified from AOCI (3) 0
Deferred income tax benefit (expense) (3) 1 0
Amounts reclassified from AOCI, net of income tax (2) 0
Balance, end of period 317 472
Changes in Nonperformance Risk on Market Risk Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period (1,881) (1,378)
OCI before reclassifications 215 (7)
Deferred income tax benefit (expense) (3) (45) 2
AOCI before reclassifications, net of income tax (1,711) (1,383)
Amounts reclassified from AOCI 0 0
Deferred income tax benefit (expense) (3) 0 0
Amounts reclassified from AOCI, net of income tax 0 0
Balance, end of period (1,711) (1,383)
Changes in Discount Rates on the Liability for Future Policy Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period 720 1,020
OCI before reclassifications 315 (397)
Deferred income tax benefit (expense) (3) (66) 83
AOCI before reclassifications, net of income tax 969 706
Amounts reclassified from AOCI 0 0
Deferred income tax benefit (expense) (3) 0 0
Amounts reclassified from AOCI, net of income tax 0 0
Balance, end of period 969 706
Other (2)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period (45) (58)
OCI before reclassifications (9) 2
Deferred income tax benefit (expense) (3) 2 (1)
AOCI before reclassifications, net of income tax (52) (57)
Amounts reclassified from AOCI 1 3
Deferred income tax benefit (expense) (3) 0 (1)
Amounts reclassified from AOCI, net of income tax 1 2
Balance, end of period $ (51) $ (55)