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Unrealized Losses on Debt Investments (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value $ 4,552 $ 2,678
Less than 12 Months - Unrealized Losses (31) (5)
12 Months or Greater - Fair Value 0 39,989
12 Months or Greater - Unrealized Losses 0 (117)
Total Fair Value 4,552 42,667
Total Unrealized Losses (31) (122)
U.S. government and agency securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 2,323 1,491
Less than 12 Months - Unrealized Losses (1) (1)
12 Months or Greater - Fair Value 0 39,158
12 Months or Greater - Unrealized Losses 0 (103)
Total Fair Value 2,323 40,649
Total Unrealized Losses (1) (104)
Foreign government bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 500 25
Less than 12 Months - Unrealized Losses (3) 0
12 Months or Greater - Fair Value 0 77
12 Months or Greater - Unrealized Losses 0 (8)
Total Fair Value 500 102
Total Unrealized Losses (3) (8)
Mortgage- and asset-backed securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 1,014 664
Less than 12 Months - Unrealized Losses (6) (1)
12 Months or Greater - Fair Value 0 378
12 Months or Greater - Unrealized Losses 0 (2)
Total Fair Value 1,014 1,042
Total Unrealized Losses (6) (3)
Corporate notes and bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 649 498
Less than 12 Months - Unrealized Losses (17) (3)
12 Months or Greater - Fair Value 0 376
12 Months or Greater - Unrealized Losses 0 (4)
Total Fair Value 649 874
Total Unrealized Losses (17) $ (7)
Municipal securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 66  
Less than 12 Months - Unrealized Losses (4)  
12 Months or Greater - Fair Value 0  
12 Months or Greater - Unrealized Losses 0  
Total Fair Value 66  
Total Unrealized Losses $ (4)