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Liabilities by Class of Instrument that are Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | $ 846 | $ 681
Total liabilities | 846 | 681
Other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 670 | 501
Other liabilities | Interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 636 | 490
Other liabilities | Foreign currency swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 1 | 2
Other liabilities | Forward bond purchase commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 33 | 9
Policyholder account balances |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 176 | 180
Policyholder account balances | Fixed indexed annuity embedded derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 160 | 165
Policyholder account balances | Indexed universal life embedded derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 16 | 15
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities | 0 | 0
Level 1 | Other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 1 | Other liabilities | Interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 1 | Other liabilities | Foreign currency swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 1 | Other liabilities | Forward bond purchase commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 1 | Policyholder account balances |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 1 | Policyholder account balances | Fixed indexed annuity embedded derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 1 | Policyholder account balances | Indexed universal life embedded derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities | 637 | 492
Level 2 | Other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 637 | 492
Level 2 | Other liabilities | Interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 636 | 490
Level 2 | Other liabilities | Foreign currency swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 1 | 2
Level 2 | Other liabilities | Forward bond purchase commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 2 | Policyholder account balances |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 2 | Policyholder account balances | Fixed indexed annuity embedded derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 2 | Policyholder account balances | Indexed universal life embedded derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities | 209 | 189
Level 3 | Other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 33 | 9
Level 3 | Other liabilities | Interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 3 | Other liabilities | Foreign currency swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 0 | 0
Level 3 | Other liabilities | Forward bond purchase commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 33 | 9
Level 3 | Policyholder account balances |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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 and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | 160 | 165
Level 3 | Policyholder account balances | Indexed universal life embedded derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities, fair value | $ 16 | $ 15

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