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Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period $ (6,106) $ 47
OCI before reclassifications 972 (3,317)
Deferred income tax benefit (expense) (3) (204) 696
AOCI before reclassifications, net of income tax (5,338) (2,574)
Amounts reclassified from AOCI 64 41
Deferred income tax benefit (expense) (2) (14) (8)
Amounts reclassified from AOCI, net of income tax 50 33
Balance, end of period (5,288) (2,541)
Unrealized Investment Gains (Losses), Net of Related Offsets (1)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period (6,194) 5,285
OCI before reclassifications 1,414 (6,055)
Deferred income tax benefit (expense) (3) (296) 1,195
AOCI before reclassifications, net of income tax (5,076) 425
Amounts reclassified from AOCI 61 43
Deferred income tax benefit (expense) (2) (13) (9)
Amounts reclassified from AOCI, net of income tax 48 34
Balance, end of period (5,028) 459
Unrealized Gains (Losses) on Derivatives    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period 504 239
OCI before reclassifications (40) 19
Deferred income tax benefit (expense) (3) 8 72
AOCI before reclassifications, net of income tax 472 330
Amounts reclassified from AOCI 0 (2)
Deferred income tax benefit (expense) (2) 0 1
Amounts reclassified from AOCI, net of income tax 0 (1)
Balance, end of period 472 329
Changes in Nonperformance Risk on Market Risk Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period (1,378) (3,230)
OCI before reclassifications (7) 929
Deferred income tax benefit (expense) (3) 2 (195)
AOCI before reclassifications, net of income tax (1,383) (2,496)
Amounts reclassified from AOCI 0 0
Deferred income tax benefit (expense) (2) 0 0
Amounts reclassified from AOCI, net of income tax 0 0
Balance, end of period (1,383) (2,496)
Changes in Discount Rates on the Liability for Future Policy Benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period 1,020 (2,199)
OCI before reclassifications (397) 1,801
Deferred income tax benefit (expense) (3) 83 (378)
AOCI before reclassifications, net of income tax 706 (776)
Amounts reclassified from AOCI 0 0
Deferred income tax benefit (expense) (2) 0 0
Amounts reclassified from AOCI, net of income tax 0 0
Balance, end of period 706 (776)
Other Components of AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, beginning of period (58) (48)
OCI before reclassifications 2 (11)
Deferred income tax benefit (expense) (3) (1) 2
AOCI before reclassifications, net of income tax (57) (57)
Amounts reclassified from AOCI 3 0
Deferred income tax benefit (expense) (2) (1) 0
Amounts reclassified from AOCI, net of income tax 2 0
Balance, end of period $ (55) $ (57)