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Summary of Significant Unobservable Inputs Used for Fair Value Measurements Classified As Level 3 (Detail)
$ in Millions
Jun. 30, 2024
USD ($)
bps
Dec. 31, 2023
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liabilities, fair value | $ $ 846 $ 681
Market risk benefits, net | $ 446 582
Fixed maturity securities available-for-sale, at fair value | $ 45,233 46,781
Derivative assets, fair value | $ 80 131
Variable Annuities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefits, net | $ 403 527
Fixed Indexed Annuities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefits, net | $ 43 55
Policyholder account balances    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liabilities, fair value | $ 176 180
Policyholder account balances | Fixed indexed annuity embedded derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liabilities, fair value | $ 160 165
Policyholder account balances | Indexed universal life embedded derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liabilities, fair value | $ 16 15
U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 26,813 27,985
Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 7,636 7,811
Utilities | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 4,232 4,273
Utilities | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 710 685
Energy | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 2,322 2,372
Energy | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 1,047 1,027
Finance and insurance | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 7,028 7,278
Finance and insurance | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 1,852 1,948
Consumer-non-cyclical | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 4,353 4,505
Consumer-non-cyclical | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 598 616
Technology and communications | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 2,750 3,023
Technology and communications | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 806 891
Industrial | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 1,094 1,233
Industrial | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 803 797
Capital goods | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 2,145 2,181
Capital goods | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 595 561
Consumer-cyclical | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 1,553 1,649
Consumer-cyclical | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 231 221
Transportation | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 1,062 1,162
Transportation | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 422 364
Other | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 274 309
Other | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ 572 701
Level 3 | Other invested assets | Equity index options    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative assets, fair value | $ $ 21  
Fair value input, equity index volatility, lower limit 6.00%  
Fair value input, equity index volatility, upper limit 46.00%  
Fair value input, equity index volatility, weighted-average [1] 23.00%  
Level 3 | Other invested assets | Forward bond purchase commitments    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative assets, fair value | $ $ 21  
Fair value input, counterparty financing spread, lower limit 28  
Fair value input, counterparty financing spread, upper limit 41  
Fair value input, counterparty financing spread, weighted-average [1] 33  
Level 3 | Policyholder account balances    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liabilities, fair value | $ $ 176 180
Level 3 | Policyholder account balances | Fixed indexed annuity embedded derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liabilities, fair value | $ $ 160 165
Fair value, expected future interest credited, lower limit 1.00%  
Fair value, expected future interest credited, upper limit 3.00%  
Fair value, expected future interest credited, weighted-average [2] 2.00%  
Level 3 | Policyholder account balances | Indexed universal life embedded derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liabilities, fair value | $ $ 16 $ 15
Fair value, expected future interest credited, lower limit 2.00%  
Fair value, expected future interest credited, upper limit 12.00%  
Fair value, expected future interest credited, weighted-average [2] 5.00%  
Level 3 | Other liabilities | Forward bond purchase commitments    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liabilities, fair value | $ $ 33  
Fair value input, counterparty financing spread, lower limit 28  
Fair value input, counterparty financing spread, upper limit 42  
Fair value input, counterparty financing spread, weighted-average [2] 39  
Level 3 | Market risk benefits | Variable Annuities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefits, net | $ [3] $ 403  
Fair value, withdrawal utilization rate, lower limit [3] 63.00%  
Fair value, withdrawal utilization rate, upper limit [3] 89.00%  
Fair value, lapse rate, lower limit [3] 2.00%  
Fair value, lapse rate, upper limit [3] 11.00%  
Fair value input, credit spreads, lower limit [3] 42  
Fair value input, credit spreads, upper limit [3] 83  
Fair value input, credit spreads, weighted-average [2],[3] 69  
Fair value input, equity index volatility, lower limit [3] 14.00%  
Fair value input, equity index volatility, upper limit [3] 30.00%  
Fair value, withdrawal utilization rate, weighted-average [2],[3] 79.00%  
Fair value, lapse rate, weighted-average [2],[3] 5.00%  
Fair value input, equity index volatility, weighted-average [2],[3] 22.00%  
Level 3 | Market risk benefits | Fixed Indexed Annuities    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefits, net | $ [3] $ 43  
Fair value, withdrawal utilization rate, lower limit [3] 0.00%  
Fair value, withdrawal utilization rate, upper limit [3] 70.00%  
Fair value input, credit spreads, lower limit [3] 42  
Fair value input, credit spreads, upper limit [3] 83  
Fair value input, credit spreads, weighted-average [2],[3] 69  
Fair value, expected future interest credited, lower limit [3] 1.00%  
Fair value, expected future interest credited, upper limit [3] 3.00%  
Fair value, withdrawal utilization rate, weighted-average [2],[3] 57.00%  
Fair value, expected future interest credited, weighted-average [2],[3] 2.00%  
Level 3 | Other assets | Reinsurance recoverable    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Market risk benefits, net | $ [4] $ 117  
Fair value, lapse rate, lower limit [4] 2.00%  
Fair value, lapse rate, upper limit [4] 9.00%  
Fair value input, equity index volatility, lower limit [4] 14.00%  
Fair value input, equity index volatility, upper limit [4] 30.00%  
Fair value, lapse rate, weighted-average [1],[4] 5.00%  
Fair value input, equity index volatility, weighted-average [1],[4] 22.00%  
Counterparty credit risk, weighted-average [1],[4] 69  
Counterparty credit risk, lower limit [4] 42  
Counterparty credit risk, upper limit [4] 83  
Internal Models | Level 3 | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 1,899  
Fair value input, credit spreads, lower limit 14  
Fair value input, credit spreads, upper limit 229  
Fair value input, credit spreads, weighted-average [1] 138  
Internal Models | Level 3 | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 756  
Fair value input, credit spreads, lower limit 59  
Fair value input, credit spreads, upper limit 229  
Fair value input, credit spreads, weighted-average [1] 126  
Internal Models | Level 3 | Utilities | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 815  
Fair value input, credit spreads, lower limit 59  
Fair value input, credit spreads, upper limit 229  
Fair value input, credit spreads, weighted-average [1] 136  
Internal Models | Level 3 | Utilities | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 243  
Fair value input, credit spreads, lower limit 84  
Fair value input, credit spreads, upper limit 229  
Fair value input, credit spreads, weighted-average [1] 131  
Internal Models | Level 3 | Energy | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 45  
Fair value input, credit spreads, lower limit 93  
Fair value input, credit spreads, upper limit 166  
Fair value input, credit spreads, weighted-average [1] 134  
Internal Models | Level 3 | Energy | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 113  
Fair value input, credit spreads, lower limit 93  
Fair value input, credit spreads, upper limit 175  
Fair value input, credit spreads, weighted-average [1] 119  
Internal Models | Level 3 | Finance and insurance | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 668  
Fair value input, credit spreads, lower limit 14  
Fair value input, credit spreads, upper limit 213  
Fair value input, credit spreads, weighted-average [1] 154  
Internal Models | Level 3 | Finance and insurance | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 133  
Fair value input, credit spreads, lower limit 101  
Fair value input, credit spreads, upper limit 197  
Fair value input, credit spreads, weighted-average [1] 125  
Internal Models | Level 3 | Consumer-non-cyclical | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 63  
Fair value input, credit spreads, lower limit 68  
Fair value input, credit spreads, upper limit 210  
Fair value input, credit spreads, weighted-average [1] 131  
Internal Models | Level 3 | Consumer-non-cyclical | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 75  
Fair value input, credit spreads, lower limit 83  
Fair value input, credit spreads, upper limit 144  
Fair value input, credit spreads, weighted-average [1] 100  
Internal Models | Level 3 | Technology and communications | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 12  
Fair value input, credit spreads, lower limit 68  
Fair value input, credit spreads, upper limit 82  
Fair value input, credit spreads, weighted-average [1] 74  
Internal Models | Level 3 | Technology and communications | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 17  
Fair value input, credit spreads, lower limit 83  
Fair value input, credit spreads, upper limit 119  
Fair value input, credit spreads, weighted-average [1] 100  
Internal Models | Level 3 | Industrial | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 15  
Fair value input, credit spreads, lower limit 93  
Fair value input, credit spreads, upper limit 166  
Fair value input, credit spreads, weighted-average [1] 117  
Internal Models | Level 3 | Industrial | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 59  
Fair value input, credit spreads, lower limit 109  
Fair value input, credit spreads, upper limit 175  
Fair value input, credit spreads, weighted-average [1] 144  
Internal Models | Level 3 | Capital goods | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 54  
Fair value input, credit spreads, lower limit 83  
Fair value input, credit spreads, upper limit 160  
Fair value input, credit spreads, weighted-average [1] 127  
Internal Models | Level 3 | Capital goods | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 38  
Fair value input, credit spreads, lower limit 97  
Fair value input, credit spreads, upper limit 210  
Fair value input, credit spreads, weighted-average [1] 149  
Internal Models | Level 3 | Consumer-cyclical | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 117  
Fair value input, credit spreads, lower limit 82  
Fair value input, credit spreads, upper limit 220  
Fair value input, credit spreads, weighted-average [1] 132  
Internal Models | Level 3 | Consumer-cyclical | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 7  
Fair value input, credit spreads, upper limit 210  
Internal Models | Level 3 | Transportation | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 20  
Fair value input, credit spreads, lower limit 48  
Fair value input, credit spreads, upper limit 134  
Fair value input, credit spreads, weighted-average [1] 100  
Internal Models | Level 3 | Transportation | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 20  
Fair value input, credit spreads, lower limit 109  
Fair value input, credit spreads, upper limit 144  
Fair value input, credit spreads, weighted-average [1] 114  
Internal Models | Level 3 | Other | U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 90  
Fair value input, credit spreads, lower limit 67  
Fair value input, credit spreads, upper limit 122  
Fair value input, credit spreads, weighted-average [1] 81  
Internal Models | Level 3 | Other | Non-U.S. corporate    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities available-for-sale, at fair value | $ $ 51  
Fair value input, credit spreads, lower limit 59  
Fair value input, credit spreads, upper limit 133  
Fair value input, credit spreads, weighted-average [1] 115  
[1] Unobservable inputs weighted by the relative fair value of the associated instrument for fixed maturity securities, notional for derivative assets and the policyholder account balances associated with the instrument for the net reinsured portion of our variable annuity MRBs.
[2] Unobservable inputs weighted by the policyholder account balances associated with the instrument and notional for derivative liabilities.
[3] Refer to note 11 for additional details related to MRBs.
[4] Represents the net reinsured portion of our variable annuity MRBs.