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Unrealized Losses on Debt Investments (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Jun. 30, 2023
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value $ 945 $ 10,721
Less than 12 Months - Unrealized Losses (16) (398)
12 Months or Greater - Fair Value 59,255 53,598
12 Months or Greater - Unrealized Losses (3,253) (4,152)
Total Fair Value 60,200 64,319
Total Unrealized Losses (3,269) (4,550)
U.S. government and agency securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 292 7,950
Less than 12 Months - Unrealized Losses (8) (336)
12 Months or Greater - Fair Value 51,092 45,273
12 Months or Greater - Unrealized Losses (2,840) (3,534)
Total Fair Value 51,384 53,223
Total Unrealized Losses (2,848) (3,870)
Foreign government bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 26 77
Less than 12 Months - Unrealized Losses (1) (5)
12 Months or Greater - Fair Value 312 391
12 Months or Greater - Unrealized Losses (11) (19)
Total Fair Value 338 468
Total Unrealized Losses (12) (24)
Mortgage- and asset-backed securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 185 257
Less than 12 Months - Unrealized Losses (1) (5)
12 Months or Greater - Fair Value 403 412
12 Months or Greater - Unrealized Losses (30) (34)
Total Fair Value 588 669
Total Unrealized Losses (31) (39)
Corporate notes and bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 396 2,326
Less than 12 Months - Unrealized Losses (6) (49)
12 Months or Greater - Fair Value 7,208 7,336
12 Months or Greater - Unrealized Losses (343) (534)
Total Fair Value 7,604 9,662
Total Unrealized Losses (349) (583)
Municipal securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 46 111
Less than 12 Months - Unrealized Losses 0 (3)
12 Months or Greater - Fair Value 240 186
12 Months or Greater - Unrealized Losses (29) (31)
Total Fair Value 286 297
Total Unrealized Losses $ (29) $ (34)