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Fair Value Measurements - Changes in level 3 recurring fair value measurements, liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Liabilities:        
Fair Value Beginning of Period $ 3,441 $ 7,076 $ 2,648 $ 11,066
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 1,531 (3,693)    
Other Comprehensive Income (Loss) 0 0    
Purchases, Sales, Issuances and Settlements, Net (738) (297)    
Gross Transfers In   0    
Other 0 0    
Fair Value End of Period 3,441 7,076    
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (1,110) 4,101    
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 136 0    
Derivative liabilities, net:        
Gross Transfers Out $ 0      
Gross Transfers Out   $ 0    
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues    
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other comprehensive income (loss) Other comprehensive income (loss)    
Net realized gains/(losses)        
Derivative liabilities, net:        
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Total net realized gains (losses) Total net realized gains (losses)    
Policyholder contract deposits        
Liabilities:        
Fair Value Beginning of Period $ 6,064 $ 5,035 5,367 5,572
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 381 (658)    
Other Comprehensive Income (Loss) 0 0    
Purchases, Sales, Issuances and Settlements, Net 316 121    
Gross Transfers In 0 0    
Other 0 0    
Fair Value End of Period 6,064 5,035    
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (368) 845    
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0    
Derivative liabilities, net:        
Gross Transfers Out 0 0    
Policyholder contract deposits | Net realized gains/(losses)        
Liabilities:        
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 381 (658)    
Derivative liabilities, net        
Liabilities:        
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (15) 283    
Purchases, Sales, Issuances and Settlements, Net (261) (20)    
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 17 (224)    
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 136 0    
Derivative liabilities, net:        
Fair Value Beginning of Period (596) (428)    
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (15) 283    
Other Comprehensive Income (Loss) 0 0    
Purchases, Sales, Issuances and Settlements, Net (261) (20)    
Gross Transfers In 0 0    
Gross Transfers Out 0 0    
Other 0 0    
Fair Value End of Period (872) (165)    
Derivative liabilities, net | Net realized gains/(losses)        
Liabilities:        
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (88) 327    
Interest rate contracts        
Liabilities:        
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (50) 1    
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0    
Derivative liabilities, net:        
Fair Value Beginning of Period (311) 0    
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 57 (1)    
Other Comprehensive Income (Loss) 0 0    
Purchases, Sales, Issuances and Settlements, Net (102) (3)    
Gross Transfers In 0 0    
Gross Transfers Out 0 0    
Other 0 0    
Fair Value End of Period (356) (4)    
Foreign exchange contracts        
Liabilities:        
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period   (1)    
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period   0    
Derivative liabilities, net:        
Fair Value Beginning of Period   (1)    
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income   0    
Other Comprehensive Income (Loss)   0    
Purchases, Sales, Issuances and Settlements, Net   1    
Gross Transfers In   0    
Gross Transfers Out   0    
Other   0    
Fair Value End of Period   0    
Equity contracts        
Liabilities:        
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 51 (241)    
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 136 0    
Derivative liabilities, net:        
Fair Value Beginning of Period (271) (444)    
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (56) 301    
Other Comprehensive Income (Loss) 0 0    
Purchases, Sales, Issuances and Settlements, Net (175) (35)    
Gross Transfers In 0 0    
Gross Transfers Out 0 0    
Other 0 0    
Fair Value End of Period (502) (178)    
Credit contracts        
Liabilities:        
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period   (1)    
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period   0    
Derivative liabilities, net:        
Fair Value Beginning of Period   30    
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income   1    
Other Comprehensive Income (Loss)   0    
Purchases, Sales, Issuances and Settlements, Net   0    
Gross Transfers In   0    
Gross Transfers Out   0    
Other   0    
Fair Value End of Period   31    
Other contracts        
Liabilities:        
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 16 18    
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0    
Derivative liabilities, net:        
Fair Value Beginning of Period (14) (13)    
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (16) (18)    
Other Comprehensive Income (Loss) 0 0    
Purchases, Sales, Issuances and Settlements, Net 16 17    
Gross Transfers In 0 0    
Gross Transfers Out 0 0    
Other 0 0    
Fair Value End of Period (14) (14)    
Fortitude Re funds withheld payable        
Liabilities:        
Fair Value Beginning of Period (1,863) 2,206 (2,235) $ 5,922
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 1,165 (3,318)    
Other Comprehensive Income (Loss) 0 0    
Purchases, Sales, Issuances and Settlements, Net (793) (398)    
Gross Transfers In 0 0    
Other 0 0    
Fair Value End of Period (1,863) 2,206    
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (759) 3,480    
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0    
Derivative liabilities, net:        
Gross Transfers Out 0 0    
Fortitude Re funds withheld payable | Net realized gains/(losses)        
Liabilities:        
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 1,165 $ (3,318)    
Other Liabilities        
Liabilities:        
Fair Value Beginning of Period 112   $ 112  
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 0      
Other Comprehensive Income (Loss) 0      
Purchases, Sales, Issuances and Settlements, Net 0      
Gross Transfers In 0      
Other 0      
Fair Value End of Period 112      
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0      
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0      
Derivative liabilities, net:        
Gross Transfers Out $ 0