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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Mar. 31, 2026 | Jun. 30, 2025
--- | --- | ---
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 10,944 | $ 4,560
Less than 12 Months - Unrealized Losses | (369) | (65)
12 Months or Greater - Fair Value | 24,788 | 38,176
12 Months or Greater - Unrealized Losses | (830) | (1,560)
Total Fair Value | 35,732 | 42,736
Total Unrealized Losses | (1,199) | (1,625)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 6,800 | 2,569
Less than 12 Months - Unrealized Losses | (335) | (51)
12 Months or Greater - Fair Value | 23,042 | 34,608
12 Months or Greater - Unrealized Losses | (743) | (1,411)
Total Fair Value | 29,842 | 37,177
Total Unrealized Losses | (1,078) | (1,462)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 91 | 43
Less than 12 Months - Unrealized Losses | (2) | (2)
12 Months or Greater - Fair Value | 31 | 106
12 Months or Greater - Unrealized Losses | (3) | (7)
Total Fair Value | 122 | 149
Total Unrealized Losses | (5) | (9)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 581 | 841
Less than 12 Months - Unrealized Losses | (3) | (4)
12 Months or Greater - Fair Value | 150 | 189
12 Months or Greater - Unrealized Losses | (20) | (23)
Total Fair Value | 731 | 1,030
Total Unrealized Losses | (23) | (27)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 3,472 | 1,107
Less than 12 Months - Unrealized Losses | (29) | (8)
12 Months or Greater - Fair Value | 1,411 | 3,105
12 Months or Greater - Unrealized Losses | (44) | (98)
Total Fair Value | 4,883 | 4,212
Total Unrealized Losses | (73) | (106)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 0 | 0
Less than 12 Months - Unrealized Losses | 0 | 0
12 Months or Greater - Fair Value | 154 | 168
12 Months or Greater - Unrealized Losses | (20) | (21)
Total Fair Value | 154 | 168
Total Unrealized Losses | $ (20) | $ (21)

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