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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Jun. 30, 2023
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Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 945 | $ 10,721
Less than 12 Months - Unrealized Losses | (16) | (398)
12 Months or Greater - Fair Value | 59,255 | 53,598
12 Months or Greater - Unrealized Losses | (3,253) | (4,152)
Total Fair Value | 60,200 | 64,319
Total Unrealized Losses | (3,269) | (4,550)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 292 | 7,950
Less than 12 Months - Unrealized Losses | (8) | (336)
12 Months or Greater - Fair Value | 51,092 | 45,273
12 Months or Greater - Unrealized Losses | (2,840) | (3,534)
Total Fair Value | 51,384 | 53,223
Total Unrealized Losses | (2,848) | (3,870)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 26 | 77
Less than 12 Months - Unrealized Losses | (1) | (5)
12 Months or Greater - Fair Value | 312 | 391
12 Months or Greater - Unrealized Losses | (11) | (19)
Total Fair Value | 338 | 468
Total Unrealized Losses | (12) | (24)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 185 | 257
Less than 12 Months - Unrealized Losses | (1) | (5)
12 Months or Greater - Fair Value | 403 | 412
12 Months or Greater - Unrealized Losses | (30) | (34)
Total Fair Value | 588 | 669
Total Unrealized Losses | (31) | (39)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 396 | 2,326
Less than 12 Months - Unrealized Losses | (6) | (49)
12 Months or Greater - Fair Value | 7,208 | 7,336
12 Months or Greater - Unrealized Losses | (343) | (534)
Total Fair Value | 7,604 | 9,662
Total Unrealized Losses | (349) | (583)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 46 | 111
Less than 12 Months - Unrealized Losses | 0 | (3)
12 Months or Greater - Fair Value | 240 | 186
12 Months or Greater - Unrealized Losses | (29) | (31)
Total Fair Value | 286 | 297
Total Unrealized Losses | $ (29) | $ (34)

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