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Accumulated Other Comprehensive Income Loss - AOCI Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 16,447  
OCI, net of tax $ 381 $ 1,063 883 $ 844
Ending balance 18,450 17,008 18,450 17,008
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (1,029) (1,732) (1,539) (1,482)
OCI before reclassifications 451 1,292 1,061 900
Amounts reclassified from AOCI 21 50 57 127
OCI, before tax 472 1,342 1,118 1,027
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (99) (281) (235) (216)
OCI, net of tax 373 1,061 883 811
Ending balance (656) (671) (656) (671)
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (5) (7) (6) (8)
OCI before reclassifications 3 2 4 3
Amounts reclassified from AOCI 0 1 0 1
OCI, before tax 3 3 4 4
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (1) (1) (1) (1)
OCI, net of tax 2 2 3 3
Ending balance (3) (5) (3) (5)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 6 30 40 21
OCI before reclassifications 14 2 (22) 13
Amounts reclassified from AOCI (3) 2 (10) 2
OCI, before tax 11 4 (32) 15
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (2) (1) 7 (3)
OCI, net of tax 9 3 (25) 12
Ending balance 15 33 15 33
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 45 35 29 37
OCI before reclassifications (3) 8 18 5
Amounts reclassified from AOCI 0 0 0 0
OCI, before tax (3) 8 18 5
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 1 (2) (4) (1)
OCI, net of tax (2) 6 14 4
Ending balance 43 41 43 41
AOCI, Liability for Future Policy Benefit, Parent        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 29 35 33 25
OCI before reclassifications (9) (20) (14) (8)
Amounts reclassified from AOCI 0 0 0 0
OCI, before tax (9) (20) (14) (8)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent 2 4 3 2
OCI, net of tax (7) (16) (11) (6)
Ending balance 22 19 22 19
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (1,430) (1,429) (1,443) (1,442)
OCI before reclassifications 0 0 0 0
Amounts reclassified from AOCI 8 9 24 25
OCI, before tax 8 9 24 25
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (2) (2) (5) (5)
OCI, net of tax 6 7 19 20
Ending balance (1,424) (1,422) (1,424) (1,422)
AOCI Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (2,384) (3,068) (2,886) (2,849)
OCI before reclassifications 456 1,284 1,047 913
Amounts reclassified from AOCI 26 62 71 155
OCI, before tax 482 1,346 1,118 1,068
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (101) (283) (235) (224)
OCI, net of tax 381 1,063 883 844
Ending balance $ (2,003) $ (2,005) $ (2,003) $ (2,005)