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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 | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 28,071 | $ 24,301
Total Unrealized Losses | 5,385 | 4,128
Less than 12 months Fair Value | 10,155 | 6,716
Less than 12 months Unrealized Losses | 557 | 197
12 months or Longer Fair Value | 17,916 | 17,585
12 months or Longer Unrealized Losses | 4,828 | 3,931
U.S. government and agencies | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 65 | 106
Total Unrealized Losses | 12 | 3
Less than 12 months Fair Value | 20 | 59
Less than 12 months Unrealized Losses | 6 | 1
12 months or Longer Fair Value | 45 | 47
12 months or Longer Unrealized Losses | 6 | 2
Japan government and agencies | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 12,544 | 8,136
Total Unrealized Losses | 3,260 | 2,234
Less than 12 months Fair Value | 7,003 | 2,070
Less than 12 months Unrealized Losses | 447 | 57
12 months or Longer Fair Value | 5,541 | 6,066
12 months or Longer Unrealized Losses | 2,813 | 2,177
Municipalities | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 632 | 666
Total Unrealized Losses | 60 | 53
Less than 12 months Fair Value | 22 | 67
Less than 12 months Unrealized Losses | 2 | 3
12 months or Longer Fair Value | 610 | 599
12 months or Longer Unrealized Losses | 58 | 50
Municipalities | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 418 | 341
Total Unrealized Losses | 130 | 79
Less than 12 months Fair Value | 118 | 96
Less than 12 months Unrealized Losses | 3 | 2
12 months or Longer Fair Value | 300 | 245
12 months or Longer Unrealized Losses | 127 | 77
Mortgage- and asset-backed securities | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,028 | 567
Total Unrealized Losses | 45 | 34
Less than 12 months Fair Value | 659 | 173
Less than 12 months Unrealized Losses | 19 | 2
12 months or Longer Fair Value | 369 | 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 | 199 | 196
Total Unrealized Losses | 34 | 23
Less than 12 months Fair Value | 22 | 12
Less than 12 months Unrealized Losses | 1 | 0
12 months or Longer Fair Value | 177 | 184
12 months or Longer Unrealized Losses | 33 | 23
Public utilities | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,195 | 1,570
Total Unrealized Losses | 111 | 151
Less than 12 months Fair Value | 231 | 699
Less than 12 months Unrealized Losses | 4 | 19
12 months or Longer Fair Value | 964 | 871
12 months or Longer Unrealized Losses | 107 | 132
Public utilities | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 999 | 1,020
Total Unrealized Losses | 199 | 108
Less than 12 months Fair Value | 76 | 368
Less than 12 months Unrealized Losses | 4 | 11
12 months or Longer Fair Value | 923 | 652
12 months or Longer Unrealized Losses | 195 | 97
Sovereign and supranational | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 45 | 47
Total Unrealized Losses | 12 | 8
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 45 | 47
12 months or Longer Unrealized Losses | 12 | 8
Banks/financial institutions | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 229 | 625
Total Unrealized Losses | 20 | 36
Less than 12 months Fair Value | 27 | 376
Less than 12 months Unrealized Losses | 0 | 7
12 months or Longer Fair Value | 202 | 249
12 months or Longer Unrealized Losses | 20 | 29
Banks/financial institutions | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 3,419 | 3,197
Total Unrealized Losses | 441 | 342
Less than 12 months Fair Value | 585 | 471
Less than 12 months Unrealized Losses | 18 | 22
12 months or Longer Fair Value | 2,834 | 2,726
12 months or Longer Unrealized Losses | 423 | 320
Other corporate | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 4,843 | 6,097
Total Unrealized Losses | 575 | 752
Less than 12 months Fair Value | 614 | 2,036
Less than 12 months Unrealized Losses | 12 | 59
12 months or Longer Fair Value | 4,229 | 4,061
12 months or Longer Unrealized Losses | 563 | 693
Other corporate | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,455 | 1,733
Total Unrealized Losses | 486 | 305
Less than 12 months Fair Value | 778 | 289
Less than 12 months Unrealized Losses | 41 | 14
12 months or Longer Fair Value | 1,677 | 1,444
12 months or Longer Unrealized Losses | $ 445 | $ 291

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