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Accumulated Other Comprehensive Income Loss - AOCI Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 15,327  
Other comprehensive income (loss), net of tax $ 1,063 $ (654) 844 $ (337)
Ending balance 17,008 13,679 17,008 13,679
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (1,732) (2,277) (1,482) (2,594)
OCI before reclassifications 1,292 (876) 900 (522)
Amounts reclassified from AOCI 50 26 127 74
OCI, before tax 1,342 (850) 1,027 (448)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (281) 179 (216) 94
Other comprehensive income (loss), net of tax 1,061 (671) 811 (354)
Ending balance (671) (2,948) (671) (2,948)
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (7) (10) (8) (7)
OCI before reclassifications 2 (1) 3 (7)
Amounts reclassified from AOCI 1 2 1 4
OCI, before tax 3 1 4 (3)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (1) 0 (1) 1
Other comprehensive income (loss), net of tax 2 1 3 (2)
Ending balance (5) (9) (5) (9)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 30 31 21 40
OCI before reclassifications 2 (5) 13 (19)
Amounts reclassified from AOCI 2 (1) 2 2
OCI, before tax 4 (6) 15 (17)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (1) 2 (3) 4
Other comprehensive income (loss), net of tax 3 (4) 12 (13)
Ending balance 33 27 33 27
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 35 36 37 31
OCI before reclassifications 8 (1) 5 5
Amounts reclassified from AOCI 0 0 0 0
OCI, before tax 8 (1) 5 5
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (2) 0 (1) (1)
Other comprehensive income (loss), net of tax 6 (1) 4 4
Ending balance 41 35 41 35
AOCI, Liability for Future Policy Benefit, Parent        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 35 32 25 35
OCI before reclassifications (20) 19 (8) 15
Amounts reclassified from AOCI 0 0 0 0
OCI, before tax (20) 19 (8) 15
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 4 (4) 2 (3)
Other comprehensive income (loss), net of tax (16) 15 (6) 12
Ending balance 19 47 19 47
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (1,429) (1,336) (1,442) (1,346)
OCI before reclassifications 0 1 0 0
Amounts reclassified from AOCI 9 7 25 20
OCI, before tax 9 8 25 20
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (2) (2) (5) (4)
Other comprehensive income (loss), net of tax 7 6 20 16
Ending balance (1,422) (1,330) (1,422) (1,330)
AOCI Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (3,068) (3,524) (2,849) (3,841)
OCI before reclassifications 1,284 (863) 913 (528)
Amounts reclassified from AOCI 62 34 155 100
OCI, before tax 1,346 (829) 1,068 (428)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (283) 175 (224) 91
Other comprehensive income (loss), net of tax 1,063 (654) 844 (337)
Ending balance $ (2,005) $ (4,178) $ (2,005) $ (4,178)