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Fair Value Measurements - Changes in level 3 recurring fair value measurements, liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Liabilities:                    
Fair Value Beginning of Period $ 2,088 $ 1,889 $ 2,088 $ 1,889 $ 3,796 $ 2,648 $ 3,815 $ 11,066    
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (1,639) (1,921) 145 (8,846)            
Other Comprehensive Income (Loss) 0 0 0 0            
Purchases, Sales, Issuances and Settlements, Net (69) (11) (705) (255)            
Gross Transfers In 0 0   (81)            
Other 0 0 0 0            
Fair Value End of Period 2,088 1,889 2,088 1,889            
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 2,162 2,036 1,148 9,634            
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0            
Derivative liabilities, net:                    
Gross Transfers Out     $ 0              
Gross Transfers Out $ 0 $ 6   $ 5            
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 loss Other comprehensive loss Other comprehensive loss Other comprehensive loss            
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues Revenues Revenues            
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other comprehensive loss Other comprehensive loss Other comprehensive loss Other comprehensive loss            
Market risk benefit liabilities, at fair value $ 4,519   $ 4,519     4,736     $ 8,739 $ 8,739
Recurring Basis                    
Derivative liabilities, net:                    
Market risk benefit liabilities, at fair value 4,519   4,519     4,736        
Level 3 | Recurring Basis                    
Derivative liabilities, net:                    
Market risk benefit liabilities, at fair value $ 4,519 $ 4,600 $ 4,519 $ 4,600   4,736        
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) Total net realized gains (losses) Total net realized gains (losses)            
Fair Value, Asset, 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) Total net realized gains (losses) Total net realized gains (losses)            
Policyholder contract deposits                    
Liabilities:                    
Fair Value Beginning of Period $ 6,327 $ 4,743 $ 6,327 $ 4,743 6,813 5,367 4,728 5,572    
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (716) (274) 94 (1,477)            
Other Comprehensive Income (Loss) 0 0 0 0            
Purchases, Sales, Issuances and Settlements, Net 230 289 866 648            
Gross Transfers In 0 0 0 0            
Other 0 0 0 0            
Fair Value End of Period 6,327 4,743 6,327 4,743            
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 972 287 296 1,724            
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0            
Derivative liabilities, net:                    
Gross Transfers Out 0 0 0 0            
Derivative liabilities, net                    
Liabilities:                    
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 220 110 223 482            
Purchases, Sales, Issuances and Settlements, Net (141) (190) (545) (327)            
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 51 (42) 181 (197)            
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0            
Derivative liabilities, net:                    
Fair Value Beginning of Period (997) (275) (596) (428)            
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 220 110 223 482            
Other Comprehensive Income (Loss) 0 0 0 0            
Purchases, Sales, Issuances and Settlements, Net (141) (190) (545) (327)            
Gross Transfers In 0 0 0 (81)            
Gross Transfers Out 0 6 0 5            
Other 0 0 0 0            
Fair Value End of Period (918) (349) (918) (349)            
Interest rate contracts                    
Liabilities:                    
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 181 30 146 27            
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0            
Derivative liabilities, net:                    
Fair Value Beginning of Period (339) (143) (311) 0            
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (174) 37 (90) 48            
Other Comprehensive Income (Loss) 0 0 0 0            
Purchases, Sales, Issuances and Settlements, Net (20) (110) (132) (183)            
Gross Transfers In 0 0 0 (81)            
Gross Transfers Out 0 6 0 6            
Other 0 0 0 0            
Fair Value End of Period (533) (210) (533) (210)            
Foreign exchange contracts                    
Liabilities:                    
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 0 (4) (1)            
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0            
Derivative liabilities, net:                    
Fair Value Beginning of Period 2 1 0 (1)            
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (1) 0 1 1            
Other Comprehensive Income (Loss) 0 0 0 0            
Purchases, Sales, Issuances and Settlements, Net 1 0 1 1            
Gross Transfers In 0 0 0 0            
Gross Transfers Out 0 0 0 0            
Other 0 0 0 0            
Fair Value End of Period 2 1 2 1            
Equity contracts                    
Liabilities:                    
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (147) (89) (11) (272)            
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0            
Derivative liabilities, net:                    
Fair Value Beginning of Period (645) (149) (271) (444)            
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 411 88 362 478            
Other Comprehensive Income (Loss) 0 0 0 0            
Purchases, Sales, Issuances and Settlements, Net (137) (94) (462) (188)            
Gross Transfers In 0 0 0 0            
Gross Transfers Out 0 0 0 (1)            
Other 0 0 0 0            
Fair Value End of Period (371) (155) (371) (155)            
Credit contracts                    
Liabilities:                    
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 0 1 0            
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0            
Derivative liabilities, net:                    
Fair Value Beginning of Period 0 32 0 30            
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income 1 1 0 3            
Other Comprehensive Income (Loss) 0 0 0 0            
Purchases, Sales, Issuances and Settlements, Net (1) (2) 0 (2)            
Gross Transfers In 0 0 0 0            
Gross Transfers Out 0 0 0 0            
Other 0 0 0 0            
Fair Value End of Period 0 31 0 31            
Other contracts                    
Liabilities:                    
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 17 17 49 49            
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0            
Derivative liabilities, net:                    
Fair Value Beginning of Period (15) (16) (14) (13)            
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (17) (16) (50) (48)            
Other Comprehensive Income (Loss) 0 0 0 0            
Purchases, Sales, Issuances and Settlements, Net 16 16 48 45            
Gross Transfers In 0 0 0 0            
Gross Transfers Out 0 0 0 0            
Other 0 0 0 0            
Fair Value End of Period (16) (16) (16) (16)            
Fortitude Re funds withheld payable                    
Liabilities:                    
Fair Value Beginning of Period (3,413) (2,505) (3,413) (2,505) (2,118) (2,235) $ (638) $ 5,922    
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (1,137) (1,757) (152) (7,851)            
Other Comprehensive Income (Loss) 0 0 0 0            
Purchases, Sales, Issuances and Settlements, Net (158) (110) (1,026) (576)            
Gross Transfers In 0 0 0 0            
Other 0 0 0 0            
Fair Value End of Period (3,413) (2,505) (3,413) (2,505)            
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 1,139 1,791 671 8,107            
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0            
Derivative liabilities, net:                    
Gross Transfers Out 0 $ 0 0 $ 0            
Other Liabilities                    
Liabilities:                    
Fair Value Beginning of Period 92   92   $ 98 $ 112        
MRBs and Net Realized and Unrealized (Gains) Losses Included in Income (6)   (20)              
Other Comprehensive Income (Loss) 0   0              
Purchases, Sales, Issuances and Settlements, Net 0   0              
Gross Transfers In 0   0              
Other 0   0              
Fair Value End of Period 92   92              
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0   0              
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