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INVESTMENTS - Fair Value and Gross Unrealized Losses for Securities That Have Been in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | $ 24,301 | $ 25,402
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 4,128 | 3,449
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 6,716 | 4,239
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 197 | 364
12 months or longer Unrealized Losses | 17,585 | 21,163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,931 | 3,085
U.S. dollar-denominated | U.S. government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 106 | 123
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 3 | 4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 59 | 53
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 1
12 months or longer Unrealized Losses | 47 | 70
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2 | 3
U.S. dollar-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 666 | 703
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 53 | 38
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 67 | 31
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3 | 1
12 months or longer Unrealized Losses | 599 | 672
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 50 | 37
U.S. dollar-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 567 | 925
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 34 | 56
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 173 | 340
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 6
12 months or longer Unrealized Losses | 394 | 585
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 32 | 50
U.S. dollar-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 1,570 | 1,120
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 151 | 114
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 699 | 228
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 19 | 4
12 months or longer Unrealized Losses | 871 | 892
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 132 | 110
U.S. dollar-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total |  | 35
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total |  | 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0
12 months or longer Unrealized Losses |  | 35
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 8
U.S. dollar-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 625 | 655
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 36 | 51
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 376 | 159
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 7 | 4
12 months or longer Unrealized Losses | 249 | 496
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 29 | 47
U.S. dollar-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 6,097 | 6,380
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 752 | 665
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,036 | 799
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 59 | 19
12 months or longer Unrealized Losses | 4,061 | 5,581
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 693 | 646
Yen-denominated | Japan government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 8,136 | 8,393
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 2,234 | 1,696
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,070 | 1,657
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 57 | 303
12 months or longer Unrealized Losses | 6,066 | 6,736
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,177 | 1,393
Yen-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 341 | 301
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 79 | 58
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 96 | 34
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2 | 0
12 months or longer Unrealized Losses | 245 | 267
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 77 | 58
Yen-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 196 | 58
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 23 | 11
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 12 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
12 months or longer Unrealized Losses | 184 | 58
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 23 | 11
Yen-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 1,020 | 1,028
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 108 | 82
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 368 | 444
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 11 | 13
12 months or longer Unrealized Losses | 652 | 584
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 97 | 69
Yen-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 47 | 60
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 8 | 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
12 months or longer Unrealized Losses | 47 | 60
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 8 | 7
Yen-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 3,197 | 3,673
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 342 | 365
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 471 | 186
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 22 | 4
12 months or longer Unrealized Losses | 2,726 | 3,487
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 320 | 361
Yen-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Total | 1,733 | 1,948
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 305 | 294
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 289 | 308
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 14 | 9
12 months or longer Unrealized Losses | 1,444 | 1,640
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 291 | $ 285

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