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Equity (Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance [1] $ (3,806)    
Income tax benefit (expense) 837 $ (2,555) [2] $ (1,151) [2]
Ending balance (6,504) [3] (3,806) [1]  
Foreign  Currency Translation Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (2,274) (1,107) 52
Cumulative effect of adoption of ASU 2018-12     0
Change in OCI before reclassification (246) (1,145) (1,021)
Amounts reclassified from AOCI (18) 15 (65)
Income tax benefit (expense) (148) (37) (73)
Ending balance (2,686) (2,274) (1,107)
Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (16,194) 26,640 34,065
Cumulative effect of adoption of ASU 2018-12     4,168
Change in OCI before reclassification 5,076 (56,430) (12,467)
Amounts reclassified from AOCI 1,143 586 (2,486)
Income tax benefit (expense) (1,238) 13,010 3,360
Ending balance (11,213) (16,194) 26,640
Interest rate remeasurement of Liability for Future Policy Benefits      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 15,242 (33,220) 0
Cumulative effect of adoption of ASU 2018-12     (47,818)
Change in OCI before reclassification (8,770) 63,643 18,941
Amounts reclassified from AOCI 0 0 0
Income tax benefit (expense) 2,075 (15,181) (4,343)
Ending balance 8,547 15,242 (33,220)
Gains (losses) from Changes in Non-performance Risk on Market Risk Benefits      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 1,448 707 0
Cumulative effect of adoption of ASU 2018-12     1,254
Change in OCI before reclassification (693) 938 (693)
Amounts reclassified from AOCI 0 0 0
Income tax benefit (expense) 145 (197) 146
Ending balance 900 1,448 707
Pension and Postretirement Unrecognized Net Periodic Benefit (Cost)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (2,028) (2,513) (3,379)
Cumulative effect of adoption of ASU 2018-12     0
Change in OCI before reclassification (98) 478 843
Amounts reclassified from AOCI 71 157 264
Income tax benefit (expense) 3 (150) (241)
Ending balance (2,052) (2,028) (2,513)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (3,806) (9,493) 30,738
Cumulative effect of adoption of ASU 2018-12     (42,396)
Change in OCI before reclassification (4,731) 7,484 5,603
Amounts reclassified from AOCI 1,196 758 (2,287)
Income tax benefit (expense) 837 (2,555) (1,151)
Ending balance (6,504) (3,806) (9,493)
Net unrealized gains (losses) on all other investments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (24,959) 40,415 58,442
Cumulative effect of adoption of ASU 2018-12     (12)
Ending balance (17,179) (24,959) 40,415
Cash flow hedges | Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 2,616 1,019  
Ending balance 869 2,616 1,019
Fair value hedges | Net Unrealized Investment Gains (Losses)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (54) (35)  
Ending balance $ (60) $ (54) $ (35)
[1] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.
[2] Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.
[3] See Note 24 for additional information regarding related party transactions.