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Unrealized Losses on Debt Investments (Detail) - USD ($)
$ in Millions
Jun. 30, 2023
Jun. 30, 2022
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value $ 10,721 $ 69,641
Less than 12 Months - Unrealized Losses (398) (2,368)
12 Months or Greater - Fair Value 53,598 3,138
12 Months or Greater - Unrealized Losses (4,152) (446)
Total Fair Value 64,319 72,779
Total Unrealized Losses (4,550) (2,814)
U.S. government and agency securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 7,950 59,092
Less than 12 Months - Unrealized Losses (336) (1,835)
12 Months or Greater - Fair Value 45,273 2,210
12 Months or Greater - Unrealized Losses (3,534) (352)
Total Fair Value 53,223 61,302
Total Unrealized Losses (3,870) (2,187)
Foreign government bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 77 418
Less than 12 Months - Unrealized Losses (5) (18)
12 Months or Greater - Fair Value 391 27
12 Months or Greater - Unrealized Losses (19) (6)
Total Fair Value 468 445
Total Unrealized Losses (24) (24)
Mortgage- and asset-backed securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 257 510
Less than 12 Months - Unrealized Losses (5) (26)
12 Months or Greater - Fair Value 412 41
12 Months or Greater - Unrealized Losses (34) (4)
Total Fair Value 669 551
Total Unrealized Losses (39) (30)
Corporate notes and bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 2,326 9,443
Less than 12 Months - Unrealized Losses (49) (477)
12 Months or Greater - Fair Value 7,336 786
12 Months or Greater - Unrealized Losses (534) (77)
Total Fair Value 9,662 10,229
Total Unrealized Losses (583) (554)
Municipal securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 111 178
Less than 12 Months - Unrealized Losses (3) (12)
12 Months or Greater - Fair Value 186 74
12 Months or Greater - Unrealized Losses (31) (7)
Total Fair Value 297 252
Total Unrealized Losses $ (34) $ (19)