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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance   $ 74,841 $ 69,701 $ 64,170  
Other comprehensive income (loss) before reclassifications, net of tax $ (5)        
Other comprehensive income (loss)   (1,598) (314) 395  
End of year balance   71,769 74,841 69,701  
Cumulative Effect, Period of Adoption, Adjustment          
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance     (766) [1] (3) [2]  
End of year balance [1]       (766)  
Net unrealized investment gains (losses)          
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance   798 1,214 774  
Other comprehensive income (loss) before reclassifications, net of tax   (2,556) (530) 415  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax   239 (26) 25  
Other comprehensive income (loss)   (2,317) (556) 440  
End of year balance   (1,519) 798 1,214  
OCI before reclassifications, pre-tax   (3,021) (644) 497  
Amounts reclassified, pre-tax   315 (32) 31  
Net unrealized investment gains (losses) | Cumulative Effect, Period of Adoption, Adjustment          
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance   0 140 0  
End of year balance     0 140  
Adoption of new accounting standard, pre-tax     0 181 $ 0
Change in discount rate on long-duration insurance reserves          
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance   (651) 0 0  
Other comprehensive income (loss) before reclassifications, net of tax   870 255 0  
Other comprehensive income (loss)   870 255 0  
End of year balance   219 (651) 0  
OCI before reclassifications, pre-tax   1,126 328 0  
Change in discount rate on long-duration insurance reserves | Cumulative Effect, Period of Adoption, Adjustment          
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance   0 (906) 0  
End of year balance     0 (906)  
Adoption of new accounting standard, pre-tax     0 (1,166) $ 0
Foreign currency translation adjustments          
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance   0 7 4  
Other comprehensive income (loss) before reclassifications, net of tax   0 (7) 3  
Other comprehensive income (loss)   0 (7) 3  
End of year balance   0 0 7  
Net cash flow hedges          
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance   222 248 279  
Other comprehensive income (loss) before reclassifications, net of tax   28 0 (5)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax   (11) (26) (26)  
Other comprehensive income (loss)   17 (26) (31)  
End of year balance   239 222 248  
OCI before reclassifications, pre-tax   38 0 (7)  
Amounts reclassified, pre-tax   (15) (34) (35)  
Amount expected to be reclassified   11      
Pension and other postretirement benefits          
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance   (35) (55) (38)  
Other comprehensive income (loss) before reclassifications, net of tax   (170) 15 (22)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax   2 5 5  
Other comprehensive income (loss)   (168) 20 (17)  
End of year balance   (203) (35) (55)  
OCI before reclassifications, pre-tax   (229) 20 (30)  
Amounts reclassified, pre-tax   3 6 7  
AOCI Including Portion Attributable to Noncontrolling Interest          
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance   334 1,414 1,019  
End of year balance   (1,264) 334 1,414  
AOCI Including Portion Attributable to Noncontrolling Interest | Cumulative Effect, Period of Adoption, Adjustment          
Changes in Accumulated Other Comprehensive Income (Loss) by Component          
Beginning of year balance   (766) 0    
End of year balance   $ 0 $ (766) $ 0  
[1] Reflects the adoption of ASU 2018-12, Targeted Improvements to the Accounting for Long-Duration Contracts (Topic 944) during the year ended December 31, 2021. See Note 8 ‘‘Other Insurance Liabilities and Separate Accounts’’ for additional information.
[2] Reflects the adoption of Accounting Standards Update (“ASU”) 2016-13, Financial Instruments - Credit Losses (Topic 326), which resulted in a reduction to retained earnings of $3 million during the year ended December 31, 2020.