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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023
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Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 3,018 | $ 10,721
Less than 12 Months - Unrealized Losses | (89) | (398)
12 Months or Greater - Fair Value | 59,872 | 53,598
12 Months or Greater - Unrealized Losses | (4,783) | (4,152)
Total Fair Value | 62,890 | 64,319
Total Unrealized Losses | (4,872) | (4,550)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 526 | 7,950
Less than 12 Months - Unrealized Losses | (23) | (336)
12 Months or Greater - Fair Value | 51,241 | 45,273
12 Months or Greater - Unrealized Losses | (4,124) | (3,534)
Total Fair Value | 51,767 | 53,223
Total Unrealized Losses | (4,147) | (3,870)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 72 | 77
Less than 12 Months - Unrealized Losses | (4) | (5)
12 Months or Greater - Fair Value | 411 | 391
12 Months or Greater - Unrealized Losses | (20) | (19)
Total Fair Value | 483 | 468
Total Unrealized Losses | (24) | (24)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 309 | 257
Less than 12 Months - Unrealized Losses | (12) | (5)
12 Months or Greater - Fair Value | 417 | 412
12 Months or Greater - Unrealized Losses | (40) | (34)
Total Fair Value | 726 | 669
Total Unrealized Losses | (52) | (39)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 2,044 | 2,326
Less than 12 Months - Unrealized Losses | (49) | (49)
12 Months or Greater - Fair Value | 7,568 | 7,336
12 Months or Greater - Unrealized Losses | (563) | (534)
Total Fair Value | 9,612 | 9,662
Total Unrealized Losses | (612) | (583)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 67 | 111
Less than 12 Months - Unrealized Losses | (1) | (3)
12 Months or Greater - Fair Value | 235 | 186
12 Months or Greater - Unrealized Losses | (36) | (31)
Total Fair Value | 302 | 297
Total Unrealized Losses | $ (37) | $ (34)

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