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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Jun. 30, 2023
--- | --- | ---
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 1,998 | $ 10,721
Less than 12 Months - Unrealized Losses | (31) | (398)
12 Months or Greater - Fair Value | 55,281 | 53,598
12 Months or Greater - Unrealized Losses | (3,460) | (4,152)
Total Fair Value | 57,279 | 64,319
Total Unrealized Losses | (3,491) | (4,550)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 650 | 7,950
Less than 12 Months - Unrealized Losses | (17) | (336)
12 Months or Greater - Fair Value | 48,044 | 45,273
12 Months or Greater - Unrealized Losses | (3,057) | (3,534)
Total Fair Value | 48,694 | 53,223
Total Unrealized Losses | (3,074) | (3,870)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 40 | 77
Less than 12 Months - Unrealized Losses | 0 | (5)
12 Months or Greater - Fair Value | 226 | 391
12 Months or Greater - Unrealized Losses | (12) | (19)
Total Fair Value | 266 | 468
Total Unrealized Losses | (12) | (24)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 264 | 257
Less than 12 Months - Unrealized Losses | (4) | (5)
12 Months or Greater - Fair Value | 339 | 412
12 Months or Greater - Unrealized Losses | (30) | (34)
Total Fair Value | 603 | 669
Total Unrealized Losses | (34) | (39)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 1,000 | 2,326
Less than 12 Months - Unrealized Losses | (9) | (49)
12 Months or Greater - Fair Value | 6,435 | 7,336
12 Months or Greater - Unrealized Losses | (332) | (534)
Total Fair Value | 7,435 | 9,662
Total Unrealized Losses | (341) | (583)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 44 | 111
Less than 12 Months - Unrealized Losses | (1) | (3)
12 Months or Greater - Fair Value | 237 | 186
12 Months or Greater - Unrealized Losses | (29) | (31)
Total Fair Value | 281 | 297
Total Unrealized Losses | $ (30) | $ (34)

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