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Unrealized Losses on Debt Investments (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Jun. 30, 2019
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value $ 11,099 $ 2,678
Less than 12 Months - Unrealized Losses (104) (5)
12 Months or Greater - Fair Value 9,678 39,989
12 Months or Greater - Unrealized Losses (20) (117)
Total Fair Value 20,777 42,667
Total Unrealized Losses (124) (122)
U.S. government and agency securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 7,650 1,491
Less than 12 Months - Unrealized Losses (97) (1)
12 Months or Greater - Fair Value 9,121 39,158
12 Months or Greater - Unrealized Losses (8) (103)
Total Fair Value 16,771 40,649
Total Unrealized Losses (105) (104)
Foreign government bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 2,545 25
Less than 12 Months - Unrealized Losses (3) 0
12 Months or Greater - Fair Value 11 77
12 Months or Greater - Unrealized Losses (7) (8)
Total Fair Value 2,556 102
Total Unrealized Losses (10) (8)
Mortgage- and asset-backed securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 684 664
Less than 12 Months - Unrealized Losses (1) (1)
12 Months or Greater - Fair Value 408 378
12 Months or Greater - Unrealized Losses (1) (2)
Total Fair Value 1,092 1,042
Total Unrealized Losses (2) (3)
Corporate notes and bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 220 498
Less than 12 Months - Unrealized Losses (3) (3)
12 Months or Greater - Fair Value 137 376
12 Months or Greater - Unrealized Losses (4) (4)
Total Fair Value 357 874
Total Unrealized Losses (7) $ (7)
Municipal securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 0  
Less than 12 Months - Unrealized Losses 0  
12 Months or Greater - Fair Value 1  
12 Months or Greater - Unrealized Losses 0  
Total Fair Value 1  
Total Unrealized Losses $ 0