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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance $ 71,769 $ 74,841 $ 69,701  
Other comprehensive income (loss) 967 (1,598) (314)  
End of year balance 76,636 71,769 74,841  
Adoption of new accounting standard, adjustment        
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance 454   (766) [1]  
End of year balance   454    
AOCI Including Portion Attributable to Noncontrolling Interest        
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance (1,264) 334 1,414  
End of year balance (297) (1,264) 334  
AOCI Including Portion Attributable to Noncontrolling Interest | Adoption of new accounting standard, adjustment        
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance 0 0 (766)  
End of year balance   0 0  
Net unrealized investment gains (losses)        
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance (1,519) 798 1,214  
Other comprehensive income (loss) before reclassifications, net of tax 603 (2,556) (530)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 487 239 (26)  
Other comprehensive income (loss) 1,090 (2,317) (556)  
End of year balance (429) (1,519) 798  
Other comprehensive income (loss) before reclassifications, pre-tax 612 (3,021) (644)  
Amounts reclassified from accumulated other comprehensive income (loss), pre-tax 566 315 (32)  
Net unrealized investment gains (losses) | Adoption of new accounting standard, adjustment        
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance 0 0 140  
End of year balance   0 0  
Adoption of new accounting standard, pre-tax   0 0 $ 181
Change in discount rate on long-duration insurance reserves        
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance 219 (651) 0  
Other comprehensive income (loss) before reclassifications, net of tax (67) 870 255  
Other comprehensive income (loss) (67) 870 255  
End of year balance 152 219 (651)  
Other comprehensive income (loss) before reclassifications, pre-tax (92) 1,126 328  
Change in discount rate on long-duration insurance reserves | Adoption of new accounting standard, adjustment        
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance 0 0 (906)  
End of year balance   0 0  
Adoption of new accounting standard, pre-tax   0 0 $ (1,166)
Foreign currency translation adjustments        
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance 0 0 7  
Other comprehensive income (loss) before reclassifications, net of tax 0 0 (7)  
Other comprehensive income (loss) 0 0 (7)  
End of year balance 0 0 0  
Net cash flow hedges        
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance 239 222 248  
Other comprehensive income (loss) before reclassifications, net of tax 19 28 0  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (14) (11) (26)  
Other comprehensive income (loss) 5 17 (26)  
End of year balance 244 239 222  
Other comprehensive income (loss) before reclassifications, pre-tax 25 38 0  
Amounts reclassified from accumulated other comprehensive income (loss), pre-tax (19) (15) (34)  
Amount expected to be reclassified 15      
Pension and other postretirement benefits        
Changes in Accumulated Other Comprehensive Income (Loss) by Component        
Beginning of year balance (203) (35) (55)  
Other comprehensive income (loss) before reclassifications, net of tax (61) (170) 15  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0 2 5  
Other comprehensive income (loss) (61) (168) 20  
End of year balance (264) (203) (35)  
Other comprehensive income (loss) before reclassifications, pre-tax (81) (229) 20  
Amounts reclassified from accumulated other comprehensive income (loss), pre-tax $ 0 $ 3 $ 6  
[1] Reflects the adoption of Accounting Standards Update (“ASU”) 2018-12, Targeted Improvements to the Accounting for Long-Duration Contracts (Topic 944) during the year ended December 31, 2021. See Note 1 ‘‘Significant Accounting Policies’’ for additional information.