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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)