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Unrealized Losses on Debt Investments (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Jun. 30, 2020
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value $ 11,124 $ 4,552
Less than 12 Months - Unrealized Losses (260) (31)
12 Months or Greater - Fair Value 0 0
12 Months or Greater - Unrealized Losses 0 0
Total Fair Value 11,124 4,552
Total Unrealized Losses (260) (31)
U.S. government and agency securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 6,755 2,323
Less than 12 Months - Unrealized Losses (223) (1)
12 Months or Greater - Fair Value 0 0
12 Months or Greater - Unrealized Losses 0 0
Total Fair Value 6,755 2,323
Total Unrealized Losses (223) (1)
Foreign government bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 1,429 500
Less than 12 Months - Unrealized Losses (3) (3)
12 Months or Greater - Fair Value 0 0
12 Months or Greater - Unrealized Losses 0 0
Total Fair Value 1,429 500
Total Unrealized Losses (3) (3)
Mortgage- and asset-backed securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 1,377 1,014
Less than 12 Months - Unrealized Losses (10) (6)
12 Months or Greater - Fair Value 0 0
12 Months or Greater - Unrealized Losses 0 0
Total Fair Value 1,377 1,014
Total Unrealized Losses (10) (6)
Corporate notes and bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 1,473 649
Less than 12 Months - Unrealized Losses (17) (17)
12 Months or Greater - Fair Value 0 0
12 Months or Greater - Unrealized Losses 0 0
Total Fair Value 1,473 649
Total Unrealized Losses (17) (17)
Municipal securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 90 66
Less than 12 Months - Unrealized Losses (7) (4)
12 Months or Greater - Fair Value 0 0
12 Months or Greater - Unrealized Losses 0 0
Total Fair Value 90 66
Total Unrealized Losses $ (7) $ (4)