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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Jun. 30, 2023 | Jun. 30, 2022
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Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 10,721 | $ 69,641
Less than 12 Months - Unrealized Losses | (398) | (2,368)
12 Months or Greater - Fair Value | 53,598 | 3,138
12 Months or Greater - Unrealized Losses | (4,152) | (446)
Total Fair Value | 64,319 | 72,779
Total Unrealized Losses | (4,550) | (2,814)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 7,950 | 59,092
Less than 12 Months - Unrealized Losses | (336) | (1,835)
12 Months or Greater - Fair Value | 45,273 | 2,210
12 Months or Greater - Unrealized Losses | (3,534) | (352)
Total Fair Value | 53,223 | 61,302
Total Unrealized Losses | (3,870) | (2,187)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 77 | 418
Less than 12 Months - Unrealized Losses | (5) | (18)
12 Months or Greater - Fair Value | 391 | 27
12 Months or Greater - Unrealized Losses | (19) | (6)
Total Fair Value | 468 | 445
Total Unrealized Losses | (24) | (24)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 257 | 510
Less than 12 Months - Unrealized Losses | (5) | (26)
12 Months or Greater - Fair Value | 412 | 41
12 Months or Greater - Unrealized Losses | (34) | (4)
Total Fair Value | 669 | 551
Total Unrealized Losses | (39) | (30)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 2,326 | 9,443
Less than 12 Months - Unrealized Losses | (49) | (477)
12 Months or Greater - Fair Value | 7,336 | 786
12 Months or Greater - Unrealized Losses | (534) | (77)
Total Fair Value | 9,662 | 10,229
Total Unrealized Losses | (583) | (554)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 111 | 178
Less than 12 Months - Unrealized Losses | (3) | (12)
12 Months or Greater - Fair Value | 186 | 74
12 Months or Greater - Unrealized Losses | (31) | (7)
Total Fair Value | 297 | 252
Total Unrealized Losses | $ (34) | $ (19)

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