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Fair Value Measurements - Net realized and unrealized gains and losses included in income related to Level 3 assets and liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets $ 126 $ 64 $ 251 $ 265
Net realized gains (losses), liabilities $ (1,639) $ (1,921) $ 145 $ (8,846)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues Revenues Revenues Revenues
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Revenues   Revenues  
Policyholder contract deposits        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities $ (716) $ (274) $ 94 $ (1,477)
Market Risk Benefit Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (880) (722) (1,680) (1,687)
Derivative liabilities, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 220 110 223 482
Fortitude Re funds withheld payable        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (1,137) (1,757) (152) (7,851)
Other Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (6)   (20)  
Bonds available for sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 141 43 300 273
Other bond securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets (3) (40) 32 (314)
Equity securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 1 (1) 3 (1)
Other invested assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets $ (13) $ 62 $ (84) $ 307
Net investment income - excluding Fortitude Re funds withheld assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net Investment Income Net Investment Income Net Investment Income Net Investment Income
Net investment income - excluding Fortitude Re funds withheld assets | Policyholder contract deposits        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities     $ 0 $ 0
Net investment income - excluding Fortitude Re funds withheld assets | Market Risk Benefit Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities $ 0 $ 0 0 0
Net investment income - excluding Fortitude Re funds withheld assets | Derivative liabilities, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities     0 0
Net investment income - excluding Fortitude Re funds withheld assets | Fortitude Re funds withheld payable        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities     0 0
Net investment income - excluding Fortitude Re funds withheld assets | Bonds available for sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 202 106 385 412
Net investment income - excluding Fortitude Re funds withheld assets | Other bond securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets (3) (40) 32 (314)
Net investment income - excluding Fortitude Re funds withheld assets | Equity securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 1 (1) 3 (1)
Net investment income - excluding Fortitude Re funds withheld assets | Other invested assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets (11) 62 (82) 307
Net realized gains/(losses) | Policyholder contract deposits        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (716) (274) 94 (1,477)
Net realized gains/(losses) | Market Risk Benefit Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (1) (2) (4) (10)
Net realized gains/(losses) | Derivative liabilities, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 415 170 392 617
Net realized gains/(losses) | Fortitude Re funds withheld payable        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (1,137) (1,757) (152) (7,851)
Net realized gains/(losses) | Other Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (6)   (20)  
Net realized gains/(losses) | Bonds available for sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets (61) $ (63) (85) (139)
Net realized gains/(losses) | Other bond securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets     0 0
Net realized gains/(losses) | Other invested assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets $ (2)   $ (2) $ 0
Change in the fair value of market risk benefits        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Change in the fair value of market risk benefits, net Change in the fair value of market risk benefits, net Change in the fair value of market risk benefits, net Change in the fair value of market risk benefits, net
Change in the fair value of market risk benefits | Policyholder contract deposits        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities $ 0 $ 0 $ 0 $ 0
Change in the fair value of market risk benefits | Market Risk Benefit Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (879) (720) (1,676) (1,677)
Change in the fair value of market risk benefits | Derivative liabilities, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (180) (43) (122) (90)
Change in the fair value of market risk benefits | Fortitude Re funds withheld payable        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Change in the fair value of market risk benefits | Other Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0   0  
Change in the fair value of market risk benefits | Bonds available for sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Change in the fair value of market risk benefits | Other bond securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Change in the fair value of market risk benefits | Equity securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Change in the fair value of market risk benefits | Other invested assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Other Income | Policyholder contract deposits        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0   0 0
Other Income | Market Risk Benefit Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0 0 0 0
Other Income | Derivative liabilities, net        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities (15) (17) (47) (45)
Other Income | Fortitude Re funds withheld payable        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0   0 0
Other Income | Other Liabilities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), liabilities 0   0  
Other Income | Bonds available for sale        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Other Income | Other bond securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Other Income | Equity securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets 0 0 0 0
Other Income | Other invested assets        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Net realized gains (losses), assets $ 0 $ 0 $ 0 $ 0