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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Mar. 31, 2025 | Jun. 30, 2024
--- | --- | ---
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 2,927 | $ 2,157
Less than 12 Months - Unrealized Losses | (70) | (25)
12 Months or Greater - Fair Value | 42,949 | 52,432
12 Months or Greater - Unrealized Losses | (1,893) | (3,323)
Total Fair Value | 45,876 | 54,589
Total Unrealized Losses | (1,963) | (3,348)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 492 | 529
Less than 12 Months - Unrealized Losses | (50) | (12)
12 Months or Greater - Fair Value | 38,754 | 45,821
12 Months or Greater - Unrealized Losses | (1,697) | (2,936)
Total Fair Value | 39,246 | 46,350
Total Unrealized Losses | (1,747) | (2,948)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 66 | 79
Less than 12 Months - Unrealized Losses | (3) | (2)
12 Months or Greater - Fair Value | 127 | 180
12 Months or Greater - Unrealized Losses | (10) | (14)
Total Fair Value | 193 | 259
Total Unrealized Losses | (13) | (16)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 649 | 201
Less than 12 Months - Unrealized Losses | (3) | (1)
12 Months or Greater - Fair Value | 227 | 409
12 Months or Greater - Unrealized Losses | (24) | (34)
Total Fair Value | 876 | 610
Total Unrealized Losses | (27) | (35)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 1,720 | 1,310
Less than 12 Months - Unrealized Losses | (14) | (9)
12 Months or Greater - Fair Value | 3,629 | 5,779
12 Months or Greater - Unrealized Losses | (137) | (310)
Total Fair Value | 5,349 | 7,089
Total Unrealized Losses | (151) | (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 | 212 | 243
12 Months or Greater - Unrealized Losses | (25) | (29)
Total Fair Value | 212 | 281
Total Unrealized Losses | $ (25) | $ (30)

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