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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 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 30,364 | $ 24,301
Total Unrealized Losses | 4,746 | 4,128
Less than 12 months Fair Value | 12,653 | 6,716
Less than 12 months Unrealized Losses | 383 | 197
12 months or Longer Fair Value | 17,711 | 17,585
12 months or Longer Unrealized Losses | 4,363 | 3,931
U.S. government and agencies | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 68 | 106
Total Unrealized Losses | 2 | 3
Less than 12 months Fair Value | 33 | 59
Less than 12 months Unrealized Losses | 0 | 1
12 months or Longer Fair Value | 35 | 47
12 months or Longer Unrealized Losses | 2 | 2
Japan government and agencies | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 11,951 | 8,136
Total Unrealized Losses | 2,608 | 2,234
Less than 12 months Fair Value | 6,090 | 2,070
Less than 12 months Unrealized Losses | 179 | 57
12 months or Longer Fair Value | 5,861 | 6,066
12 months or Longer Unrealized Losses | 2,429 | 2,177
Municipalities | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 656 | 666
Total Unrealized Losses | 68 | 53
Less than 12 months Fair Value | 72 | 67
Less than 12 months Unrealized Losses | 3 | 3
12 months or Longer Fair Value | 584 | 599
12 months or Longer Unrealized Losses | 65 | 50
Municipalities | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 339 | 341
Total Unrealized Losses | 105 | 79
Less than 12 months Fair Value | 96 | 96
Less than 12 months Unrealized Losses | 8 | 2
12 months or Longer Fair Value | 243 | 245
12 months or Longer Unrealized Losses | 97 | 77
Mortgage- and asset-backed securities | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,091 | 567
Total Unrealized Losses | 46 | 34
Less than 12 months Fair Value | 697 | 173
Less than 12 months Unrealized Losses | 20 | 2
12 months or Longer Fair Value | 394 | 394
12 months or Longer Unrealized Losses | 26 | 32
Mortgage- and asset-backed securities | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 208 | 196
Total Unrealized Losses | 29 | 23
Less than 12 months Fair Value | 22 | 12
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 186 | 184
12 months or Longer Unrealized Losses | 29 | 23
Public utilities | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,689 | 1,570
Total Unrealized Losses | 142 | 151
Less than 12 months Fair Value | 816 | 699
Less than 12 months Unrealized Losses | 17 | 19
12 months or Longer Fair Value | 873 | 871
12 months or Longer Unrealized Losses | 125 | 132
Public utilities | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,037 | 1,020
Total Unrealized Losses | 155 | 108
Less than 12 months Fair Value | 258 | 368
Less than 12 months Unrealized Losses | 23 | 11
12 months or Longer Fair Value | 779 | 652
12 months or Longer Unrealized Losses | 132 | 97
Public utilities | Other currencies |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 53 |
Total Unrealized Losses | 1 |
Less than 12 months Fair Value | 53 |
Less than 12 months Unrealized Losses | 1 |
12 months or Longer Fair Value | 0 |
12 months or Longer Unrealized Losses | 0 |
Sovereign and supranational | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 0 |
Total Unrealized Losses | 0 |
Less than 12 months Fair Value | 0 |
Less than 12 months Unrealized Losses | 0 |
12 months or Longer Fair Value | 0 |
12 months or Longer Unrealized Losses | 0 |
Sovereign and supranational | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 49 | 47
Total Unrealized Losses | 10 | 8
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 49 | 47
12 months or Longer Unrealized Losses | 10 | 8
Banks/financial institutions | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 749 | 625
Total Unrealized Losses | 30 | 36
Less than 12 months Fair Value | 544 | 376
Less than 12 months Unrealized Losses | 7 | 7
12 months or Longer Fair Value | 205 | 249
12 months or Longer Unrealized Losses | 23 | 29
Banks/financial institutions | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 3,576 | 3,197
Total Unrealized Losses | 448 | 342
Less than 12 months Fair Value | 472 | 471
Less than 12 months Unrealized Losses | 14 | 22
12 months or Longer Fair Value | 3,104 | 2,726
12 months or Longer Unrealized Losses | 434 | 320
Other corporate | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 6,596 | 6,097
Total Unrealized Losses | 689 | 752
Less than 12 months Fair Value | 2,690 | 2,036
Less than 12 months Unrealized Losses | 58 | 59
12 months or Longer Fair Value | 3,906 | 4,061
12 months or Longer Unrealized Losses | 631 | 693
Other corporate | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,302 | 1,733
Total Unrealized Losses | 413 | 305
Less than 12 months Fair Value | 810 | 289
Less than 12 months Unrealized Losses | 53 | 14
12 months or Longer Fair Value | 1,492 | 1,444
12 months or Longer Unrealized Losses | $ 360 | $ 291

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