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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 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | $ 32,056 | $ 24,301
Total Unrealized Losses | 5,223 | 4,128
Less than 12 months Fair Value | 14,482 | 6,716
Less than 12 months Unrealized Losses | 554 | 197
12 months or Longer Fair Value | 17,574 | 17,585
12 months or Longer Unrealized Losses | 4,669 | 3,931
U.S. government and agencies | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 108 | 106
Total Unrealized Losses | 2 | 3
Less than 12 months Fair Value | 73 | 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 | 11,469 | 8,136
Total Unrealized Losses | 2,935 | 2,234
Less than 12 months Fair Value | 5,838 | 2,070
Less than 12 months Unrealized Losses | 288 | 57
12 months or Longer Fair Value | 5,631 | 6,066
12 months or Longer Unrealized Losses | 2,647 | 2,177
Municipalities | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 650 | 666
Total Unrealized Losses | 85 | 53
Less than 12 months Fair Value | 88 | 67
Less than 12 months Unrealized Losses | 5 | 3
12 months or Longer Fair Value | 562 | 599
12 months or Longer Unrealized Losses | 80 | 50
Municipalities | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 341 | 341
Total Unrealized Losses | 118 | 79
Less than 12 months Fair Value | 88 | 96
Less than 12 months Unrealized Losses | 9 | 2
12 months or Longer Fair Value | 253 | 245
12 months or Longer Unrealized Losses | 109 | 77
Mortgage- and asset-backed securities | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,578 | 567
Total Unrealized Losses | 69 | 34
Less than 12 months Fair Value | 1,182 | 173
Less than 12 months Unrealized Losses | 41 | 2
12 months or Longer Fair Value | 396 | 394
12 months or Longer Unrealized Losses | 28 | 32
Mortgage- and asset-backed securities | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 214 | 196
Total Unrealized Losses | 30 | 23
Less than 12 months Fair Value | 23 | 12
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 191 | 184
12 months or Longer Unrealized Losses | 30 | 23
Public utilities | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,911 | 1,570
Total Unrealized Losses | 155 | 151
Less than 12 months Fair Value | 1,045 | 699
Less than 12 months Unrealized Losses | 30 | 19
12 months or Longer Fair Value | 866 | 871
12 months or Longer Unrealized Losses | 125 | 132
Public utilities | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,048 | 1,020
Total Unrealized Losses | 183 | 108
Less than 12 months Fair Value | 211 | 368
Less than 12 months Unrealized Losses | 10 | 11
12 months or Longer Fair Value | 837 | 652
12 months or Longer Unrealized Losses | 173 | 97
Sovereign and supranational | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 48 | 47
Total Unrealized Losses | 11 | 8
Less than 12 months Fair Value | 0 | 0
Less than 12 months Unrealized Losses | 0 | 0
12 months or Longer Fair Value | 48 | 47
12 months or Longer Unrealized Losses | 11 | 8
Banks/financial institutions | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 1,065 | 625
Total Unrealized Losses | 39 | 36
Less than 12 months Fair Value | 890 | 376
Less than 12 months Unrealized Losses | 16 | 7
12 months or Longer Fair Value | 175 | 249
12 months or Longer Unrealized Losses | 23 | 29
Banks/financial institutions | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 3,759 | 3,197
Total Unrealized Losses | 420 | 342
Less than 12 months Fair Value | 655 | 471
Less than 12 months Unrealized Losses | 16 | 22
12 months or Longer Fair Value | 3,104 | 2,726
12 months or Longer Unrealized Losses | 404 | 320
Other corporate | Dollar-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 7,675 | 6,097
Total Unrealized Losses | 738 | 752
Less than 12 months Fair Value | 3,823 | 2,036
Less than 12 months Unrealized Losses | 105 | 59
12 months or Longer Fair Value | 3,852 | 4,061
12 months or Longer Unrealized Losses | 633 | 693
Other corporate | Yen-denominated |  |
Investments, Unrealized Loss Position [Line Items] |  |
Total Fair Value | 2,190 | 1,733
Total Unrealized Losses | 438 | 305
Less than 12 months Fair Value | 566 | 289
Less than 12 months Unrealized Losses | 34 | 14
12 months or Longer Fair Value | 1,624 | 1,444
12 months or Longer Unrealized Losses | $ 404 | $ 291

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