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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Jun. 30, 2025 | Jun. 30, 2024
--- | --- | ---
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 4,560 | $ 2,157
Less than 12 Months - Unrealized Losses | (65) | (25)
12 Months or Greater - Fair Value | 38,176 | 52,432
12 Months or Greater - Unrealized Losses | (1,560) | (3,323)
Total Fair Value | 42,736 | 54,589
Total Unrealized Losses | (1,625) | (3,348)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 2,569 | 529
Less than 12 Months - Unrealized Losses | (51) | (12)
12 Months or Greater - Fair Value | 34,608 | 45,821
12 Months or Greater - Unrealized Losses | (1,411) | (2,936)
Total Fair Value | 37,177 | 46,350
Total Unrealized Losses | (1,462) | (2,948)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 43 | 79
Less than 12 Months - Unrealized Losses | (2) | (2)
12 Months or Greater - Fair Value | 106 | 180
12 Months or Greater - Unrealized Losses | (7) | (14)
Total Fair Value | 149 | 259
Total Unrealized Losses | (9) | (16)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 841 | 201
Less than 12 Months - Unrealized Losses | (4) | (1)
12 Months or Greater - Fair Value | 189 | 409
12 Months or Greater - Unrealized Losses | (23) | (34)
Total Fair Value | 1,030 | 610
Total Unrealized Losses | (27) | (35)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 1,107 | 1,310
Less than 12 Months - Unrealized Losses | (8) | (9)
12 Months or Greater - Fair Value | 3,105 | 5,779
12 Months or Greater - Unrealized Losses | (98) | (310)
Total Fair Value | 4,212 | 7,089
Total Unrealized Losses | (106) | (319)
Municipal securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 0 | 38
Less than 12 Months - Unrealized Losses | 0 | (1)
12 Months or Greater - Fair Value | 168 | 243
12 Months or Greater - Unrealized Losses | (21) | (29)
Total Fair Value | 168 | 281
Total Unrealized Losses | $ (21) | $ (30)

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