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Unrealized Losses on Debt Investments (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Jun. 30, 2022
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value $ 71,035 $ 69,641
Less than 12 Months - Unrealized Losses (4,036) (2,368)
12 Months or Greater - Fair Value 6,679 3,138
12 Months or Greater - Unrealized Losses (1,140) (446)
Total Fair Value 77,714 72,779
Total Unrealized Losses (5,176) (2,814)
U.S. government and agency securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 61,761 59,092
Less than 12 Months - Unrealized Losses (3,411) (1,835)
12 Months or Greater - Fair Value 4,233 2,210
12 Months or Greater - Unrealized Losses (830) (352)
Total Fair Value 65,994 61,302
Total Unrealized Losses (4,241) (2,187)
Foreign government bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 392 418
Less than 12 Months - Unrealized Losses (22) (18)
12 Months or Greater - Fair Value 64 27
12 Months or Greater - Unrealized Losses (14) (6)
Total Fair Value 456 445
Total Unrealized Losses (36) (24)
Mortgage- and asset-backed securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 434 510
Less than 12 Months - Unrealized Losses (27) (26)
12 Months or Greater - Fair Value 130 41
12 Months or Greater - Unrealized Losses (18) (4)
Total Fair Value 564 551
Total Unrealized Losses (45) (30)
Corporate notes and bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 8,258 9,443
Less than 12 Months - Unrealized Losses (554) (477)
12 Months or Greater - Fair Value 2,178 786
12 Months or Greater - Unrealized Losses (271) (77)
Total Fair Value 10,436 10,229
Total Unrealized Losses (825) (554)
Municipal securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 190 178
Less than 12 Months - Unrealized Losses (22) (12)
12 Months or Greater - Fair Value 74 74
12 Months or Greater - Unrealized Losses (7) (7)
Total Fair Value 264 252
Total Unrealized Losses $ (29) $ (19)