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Unrealized Losses on Debt Investments (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Jun. 30, 2024
--- | --- | ---
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | $ 3,028 | $ 2,157
Less than 12 Months - Unrealized Losses | (88) | (25)
12 Months or Greater - Fair Value | 47,722 | 52,432
12 Months or Greater - Unrealized Losses | (2,423) | (3,323)
Total Fair Value | 50,750 | 54,589
Total Unrealized Losses | (2,511) | (3,348)
U.S. government and agency securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 871 | 529
Less than 12 Months - Unrealized Losses | (61) | (12)
12 Months or Greater - Fair Value | 42,775 | 45,821
12 Months or Greater - Unrealized Losses | (2,172) | (2,936)
Total Fair Value | 43,646 | 46,350
Total Unrealized Losses | (2,233) | (2,948)
Foreign government bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 99 | 79
Less than 12 Months - Unrealized Losses | (4) | (2)
12 Months or Greater - Fair Value | 127 | 180
12 Months or Greater - Unrealized Losses | (13) | (14)
Total Fair Value | 226 | 259
Total Unrealized Losses | (17) | (16)
Mortgage- and asset-backed securities |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 277 | 201
Less than 12 Months - Unrealized Losses | (6) | (1)
12 Months or Greater - Fair Value | 244 | 409
12 Months or Greater - Unrealized Losses | (27) | (34)
Total Fair Value | 521 | 610
Total Unrealized Losses | (33) | (35)
Corporate notes and bonds |  |
Unrealized Losses on Investments [Line Items] |  |
Less than 12 Months - Fair Value | 1,781 | 1,310
Less than 12 Months - Unrealized Losses | (17) | (9)
12 Months or Greater - Fair Value | 4,339 | 5,779
12 Months or Greater - Unrealized Losses | (184) | (310)
Total Fair Value | 6,120 | 7,089
Total Unrealized Losses | (201) | (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 | 237 | 243
12 Months or Greater - Unrealized Losses | (27) | (29)
Total Fair Value | 237 | 281
Total Unrealized Losses | $ (27) | $ (30)

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