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CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (AOCI) - Change in Each Component of AOCI (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period $ 201,838  
Balance, end of period 209,019 $ 198,353
Liability for future policyholder benefits 525  
Net unrealized gains (losses) on debt securities    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period (5,998) (614)
Other comprehensive income before reclassifications 855 (4,283)
Increase (decrease) due to amounts reclassified from AOCI (19) 6
Total other comprehensive income 836 (4,277)
Balance, end of period (5,162) (4,891)
Net unrealized gains (losses) on debt securities | Cumulative Effect, Period of Adoption, Adjustment    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 0  
Net unrealized gains (losses) on debt securities | Cumulative Effect, Period of Adoption, Adjusted Balance    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period (5,998)  
Debt valuation adjustment (DVA)    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 842 (1,187)
Other comprehensive income before reclassifications (327) 793
Increase (decrease) due to amounts reclassified from AOCI 2 0
Total other comprehensive income (325) 793
Balance, end of period 517 (394)
Debt valuation adjustment (DVA) | Cumulative Effect, Period of Adoption, Adjustment    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 0  
Debt valuation adjustment (DVA) | Cumulative Effect, Period of Adoption, Adjusted Balance    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 842  
Cash flow hedges    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period (2,522) 101
Other comprehensive income before reclassifications 6 (1,324)
Increase (decrease) due to amounts reclassified from AOCI 355 (217)
Total other comprehensive income 361 (1,541)
Balance, end of period (2,161) (1,440)
Cash flow hedges | Cumulative Effect, Period of Adoption, Adjustment    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 0  
Cash flow hedges | Cumulative Effect, Period of Adoption, Adjusted Balance    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period (2,522)  
Benefit plans    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period (5,755) (5,852)
Other comprehensive income before reclassifications (132) 292
Increase (decrease) due to amounts reclassified from AOCI 28 (121)
Total other comprehensive income (104) 171
Balance, end of period (5,859) (5,681)
Benefit plans | Cumulative Effect, Period of Adoption, Adjustment    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 0  
Benefit plans | Cumulative Effect, Period of Adoption, Adjusted Balance    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period (5,755)  
CTA, net of hedges    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period (33,637) (31,166)
Other comprehensive income before reclassifications 841 (14)
Increase (decrease) due to amounts reclassified from AOCI 0 0
Total other comprehensive income 841 (14)
Balance, end of period (32,796) (31,180)
CTA, net of hedges | Cumulative Effect, Period of Adoption, Adjustment    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 0  
CTA, net of hedges | Cumulative Effect, Period of Adoption, Adjusted Balance    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period (33,637)  
Excluded component of fair value hedges    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 8 (47)
Other comprehensive income before reclassifications (16) 46
Increase (decrease) due to amounts reclassified from AOCI (4) 2
Total other comprehensive income (20) 48
Balance, end of period (12) 1
Excluded component of fair value hedges | Cumulative Effect, Period of Adoption, Adjustment    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 0  
Excluded component of fair value hedges | Cumulative Effect, Period of Adoption, Adjusted Balance    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 8  
Long-duration insurance contracts    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 0 0
Other comprehensive income before reclassifications 5 0
Increase (decrease) due to amounts reclassified from AOCI 0 0
Total other comprehensive income 5 0
Balance, end of period 32 0
Long-duration insurance contracts | Cumulative Effect, Period of Adoption, Adjustment    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 27  
Long-duration insurance contracts | Cumulative Effect, Period of Adoption, Adjusted Balance    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period 27  
Accumulated other comprehensive income (loss)    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period (47,062) (38,765)
Other comprehensive income before reclassifications 1,232 (4,490)
Increase (decrease) due to amounts reclassified from AOCI 362 (330)
Total other comprehensive income 1,594 (4,820)
Balance, end of period (45,441) (43,585)
Accumulated other comprehensive income (loss) | Cumulative Effect, Period of Adoption, Adjustment    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period [1] 27 0
Accumulated other comprehensive income (loss) | Cumulative Effect, Period of Adoption, Adjusted Balance    
Change in accumulated other comprehensive income (loss)    
Balance, beginning of period $ (47,035) $ (38,765)
[1] See Note 1 for additional details.