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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, 2023 | Dec. 31, 2022
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Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | $ 3,449 | $ 4,528
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 364 | 2,213
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 25,402 | 31,709
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4,239 | 20,347
12 months or longer Unrealized Losses | 21,163 | 11,362
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,085 | 2,315
Dollar-denominated | U.S. government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 4 | 8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 3
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 123 | 159
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 53 | 85
12 months or longer Unrealized Losses | 70 | 74
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3 | 5
Dollar-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 38 | 89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 57
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 703 | 854
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 31 | 735
12 months or longer Unrealized Losses | 672 | 119
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 37 | 32
Dollar-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 56 | 84
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 6 | 42
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 925 | 936
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 340 | 640
12 months or longer Unrealized Losses | 585 | 296
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 50 | 42
Dollar-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 114 | 180
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 144
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,120 | 1,852
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 228 | 1,667
12 months or longer Unrealized Losses | 892 | 185
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 110 | 36
Dollar-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 8 | 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 35 | 30
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
12 months or longer Unrealized Losses | 35 | 30
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 8 | 12
Dollar-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 51 | 105
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 58
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 655 | 1,147
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 159 | 786
12 months or longer Unrealized Losses | 496 | 361
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 47 | 47
Dollar-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 665 | 1,201
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 19 | 785
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 6,380 | 10,529
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 799 | 8,636
12 months or longer Unrealized Losses | 5,581 | 1,893
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 646 | 416
Yen-denominated | Japan government and agencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 1,696 | 1,724
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 303 | 580
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 8,393 | 8,856
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,657 | 3,733
12 months or longer Unrealized Losses | 6,736 | 5,123
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 1,393 | 1,144
Yen-denominated | Municipalities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 58 | 61
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 26
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 301 | 286
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 34 | 150
12 months or longer Unrealized Losses | 267 | 136
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 58 | 35
Yen-denominated | Mortgage- and asset-backed securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 11 | 12
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 6
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 58 | 62
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 38
12 months or longer Unrealized Losses | 58 | 24
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 11 | 6
Yen-denominated | Public utilities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 82 | 108
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 13 | 61
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,028 | 880
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 444 | 576
12 months or longer Unrealized Losses | 584 | 304
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 69 | 47
Yen-denominated | Sovereign and supranational |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 7 | 5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 4
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 60 | 71
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 34
12 months or longer Unrealized Losses | 60 | 37
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7 | 1
Yen-denominated | Banks/financial institutions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 365 | 531
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 4 | 174
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 3,673 | 3,957
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 186 | 1,760
12 months or longer Unrealized Losses | 3,487 | 2,197
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 361 | 357
Yen-denominated | Other corporate |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total | 294 | 408
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 9 | 273
Debt Securities, Available-for-sale, Unrealized Loss Position, Total | 1,948 | 2,090
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 308 | 1,507
12 months or longer Unrealized Losses | 1,640 | 583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 285 | $ 135

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