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Unrealized Losses on Debt Investments (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Jun. 30, 2022
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value $ 48,310 $ 69,641
Less than 12 Months - Unrealized Losses (2,964) (2,368)
12 Months or Greater - Fair Value 12,485 3,138
12 Months or Greater - Unrealized Losses (1,775) (446)
Total Fair Value 60,795 72,779
Total Unrealized Losses (4,739) (2,814)
U.S. government and agency securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 40,516 59,092
Less than 12 Months - Unrealized Losses (2,586) (1,835)
12 Months or Greater - Fair Value 8,890 2,210
12 Months or Greater - Unrealized Losses (1,383) (352)
Total Fair Value 49,406 61,302
Total Unrealized Losses (3,969) (2,187)
Foreign government bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 365 418
Less than 12 Months - Unrealized Losses (14) (18)
12 Months or Greater - Fair Value 94 27
12 Months or Greater - Unrealized Losses (13) (6)
Total Fair Value 459 445
Total Unrealized Losses (27) (24)
Mortgage- and asset-backed securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 396 510
Less than 12 Months - Unrealized Losses (22) (26)
12 Months or Greater - Fair Value 148 41
12 Months or Greater - Unrealized Losses (21) (4)
Total Fair Value 544 551
Total Unrealized Losses (43) (30)
Corporate notes and bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 6,908 9,443
Less than 12 Months - Unrealized Losses (337) (477)
12 Months or Greater - Fair Value 3,204 786
12 Months or Greater - Unrealized Losses (339) (77)
Total Fair Value 10,112 10,229
Total Unrealized Losses (676) (554)
Municipal securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 125 178
Less than 12 Months - Unrealized Losses (5) (12)
12 Months or Greater - Fair Value 149 74
12 Months or Greater - Unrealized Losses (19) (7)
Total Fair Value 274 252
Total Unrealized Losses $ (24) $ (19)