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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023
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Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 2,157 | $ 10,721
Less than 12 Months - Unrealized Losses | (25) | (398)
12 Months or Greater - Fair Value | 52,432 | 53,598
12 Months or Greater - Unrealized Losses | (3,323) | (4,152)
Total Fair Value | 54,589 | 64,319
Total Unrealized Losses | (3,348) | (4,550)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 529 | 7,950
Less than 12 Months - Unrealized Losses | (12) | (336)
12 Months or Greater - Fair Value | 45,821 | 45,273
12 Months or Greater - Unrealized Losses | (2,936) | (3,534)
Total Fair Value | 46,350 | 53,223
Total Unrealized Losses | (2,948) | (3,870)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 79 | 77
Less than 12 Months - Unrealized Losses | (2) | (5)
12 Months or Greater - Fair Value | 180 | 391
12 Months or Greater - Unrealized Losses | (14) | (19)
Total Fair Value | 259 | 468
Total Unrealized Losses | (16) | (24)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 201 | 257
Less than 12 Months - Unrealized Losses | (1) | (5)
12 Months or Greater - Fair Value | 409 | 412
12 Months or Greater - Unrealized Losses | (34) | (34)
Total Fair Value | 610 | 669
Total Unrealized Losses | (35) | (39)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 1,310 | 2,326
Less than 12 Months - Unrealized Losses | (9) | (49)
12 Months or Greater - Fair Value | 5,779 | 7,336
12 Months or Greater - Unrealized Losses | (310) | (534)
Total Fair Value | 7,089 | 9,662
Total Unrealized Losses | (319) | (583)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 38 | 111
Less than 12 Months - Unrealized Losses | (1) | (3)
12 Months or Greater - Fair Value | 243 | 186
12 Months or Greater - Unrealized Losses | (29) | (31)
Total Fair Value | 281 | 297
Total Unrealized Losses | $ (30) | $ (34)

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