XML 59 R48.htm IDEA: XBRL DOCUMENT v3.21.4
Unrealized Losses on Debt Investments (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Jun. 30, 2021
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value $ 7,936 $ 11,389
Less than 12 Months - Unrealized Losses (85) (132)
12 Months or Greater - Fair Value 2,714 127
12 Months or Greater - Unrealized Losses (116) (3)
Total Fair Value 10,650 11,516
Total Unrealized Losses (201) (135)
U.S. government and agency securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 3,382 5,294
Less than 12 Months - Unrealized Losses (40) (111)
12 Months or Greater - Fair Value 2,206 0
12 Months or Greater - Unrealized Losses (97) 0
Total Fair Value 5,588 5,294
Total Unrealized Losses (137) (111)
Foreign government bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 82 3,148
Less than 12 Months - Unrealized Losses (2) (1)
12 Months or Greater - Fair Value 13 5
12 Months or Greater - Unrealized Losses (2) (1)
Total Fair Value 95 3,153
Total Unrealized Losses (4) (2)
Mortgage- and asset-backed securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 1,679 1,211
Less than 12 Months - Unrealized Losses (12) (5)
12 Months or Greater - Fair Value 191 87
12 Months or Greater - Unrealized Losses (3) (1)
Total Fair Value 1,870 1,298
Total Unrealized Losses (15) (6)
Corporate notes and bonds    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 2,773 1,678
Less than 12 Months - Unrealized Losses (31) (8)
12 Months or Greater - Fair Value 250 34
12 Months or Greater - Unrealized Losses (7) (1)
Total Fair Value 3,023 1,712
Total Unrealized Losses (38) (9)
Municipal securities    
Unrealized Losses on Investments [Line Items]    
Less than 12 Months - Fair Value 20 58
Less than 12 Months - Unrealized Losses 0 (7)
12 Months or Greater - Fair Value 54 1
12 Months or Greater - Unrealized Losses (7) 0
Total Fair Value 74 59
Total Unrealized Losses $ (7) $ (7)