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INVESTMENTS - Held-to-Maturity Debt Securities (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 17,824 |  | $ 19,063
Allowance for Credit Losses | 5 |  | 7
Total fixed maturity securities held to maturity | 17,819 | [1] | 19,056
Gross Unrealized Gains | 1,838 |  | 2,154
Gross Unrealized Losses | 0 |  | 0
Fair Value | 19,657 |  | 21,210
Municipalities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 266 |  | 287
Fair Value | 307 |  | 335
Public utilities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 34 |  | 37
Fair Value | 38 |  | 41
Sovereign and supranational |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 418 |  | 446
Fair Value | 462 |  | 500
Other corporate |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 18 |  | 19
Fair Value | 21 |  | 22
Yen-denominated |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 17,824 |  | 19,063
Allowance for Credit Losses | 5 |  | 7
Total fixed maturity securities held to maturity | 17,819 |  | 19,056
Gross Unrealized Gains | 1,838 |  | 2,154
Gross Unrealized Losses | 0 |  | 0
Fair Value | 19,657 |  | 21,210
Yen-denominated | Japan government and agencies |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 17,085 |  | 18,269
Allowance for Credit Losses | 2 |  | 2
Total fixed maturity securities held to maturity | 17,083 |  | 18,267
Gross Unrealized Gains | 1,746 |  | 2,045
Gross Unrealized Losses | 0 |  | 0
Fair Value | 18,829 |  | 20,312
Yen-denominated | Municipalities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 266 |  | 287
Allowance for Credit Losses | 0 |  | 0
Total fixed maturity securities held to maturity | 266 |  | 287
Gross Unrealized Gains | 41 |  | 48
Gross Unrealized Losses | 0 |  | 0
Fair Value | 307 |  | 335
Yen-denominated | Public utilities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 34 |  | 38
Allowance for Credit Losses | 0 |  | 1
Total fixed maturity securities held to maturity | 34 |  | 37
Gross Unrealized Gains | 4 |  | 4
Gross Unrealized Losses | 0 |  | 0
Fair Value | 38 |  | 41
Yen-denominated | Sovereign and supranational |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 421 |  | 450
Allowance for Credit Losses | 3 |  | 4
Total fixed maturity securities held to maturity | 418 |  | 446
Gross Unrealized Gains | 44 |  | 54
Gross Unrealized Losses | 0 |  | 0
Fair Value | 462 |  | 500
Yen-denominated | Other corporate |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 18 |  | 19
Allowance for Credit Losses | 0 |  | 0
Total fixed maturity securities held to maturity | 18 |  | 19
Gross Unrealized Gains | 3 |  | 3
Gross Unrealized Losses | 0 |  | 0
Fair Value | $ 21 |  | $ 22
[1] | Net of allowance for credit losses

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