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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period     $ 141,988  
Accounting Standards Update [Extensible Enumeration] us-gaap:AccountingStandardsUpdate201601Member us-gaap:AccountingStandardsUpdate201601Member us-gaap:AccountingStandardsUpdate201601Member us-gaap:AccountingStandardsUpdate201601Member
Other comprehensive income (loss) $ (846) $ 257 $ (1,385) $ 171
Balance, end of period 160,010 130,236 160,010 130,236
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (17) (34) (19) (38)
Unrealized gains (losses), net of tax (11) 25 (21) 45
Tax expense (benefit) included in provision for income taxes (3) 4 (6) 8
Amounts reclassified from accumulated other comprehensive income (loss) 11 (17) 23 (33)
Other comprehensive income (loss) 0 8 2 12
Balance, end of period (17) (26) (17) (26)
Derivatives | Other Income (Expense), Net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustments for (gains) losses included in other income (expense), net 14 (21) 29 (41)
Investments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period 2,800 5,287 3,222 5,478
Unrealized gains (losses), net of tax (742) (477) (1,157) (665)
Tax expense (benefit) included in provision for income taxes 0 4 2 8
Amounts reclassified from accumulated other comprehensive income (loss) (1) (15) (8) (28)
Other comprehensive income (loss) (743) (492) (1,165) (693)
Balance, end of period 2,057 4,795 2,057 4,795
Investments | Cumulative effect of accounting changes        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period 0 0 0 10
Investments | Other Income (Expense), Net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustments for (gains) losses included in other income (expense), net (1) (19) (10) (36)
Translation adjustments and other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (1,500) (2,143) (1,381) (2,254)
Other comprehensive income (loss) (103) 741 (222) 852
Balance, end of period (1,603) (1,402) (1,603) (1,402)
Accumulated other comprehensive income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period 1,283 3,110 1,822 3,186
Other comprehensive income (loss) (846) 257 (1,385) 171
Balance, end of period 437 3,367 437 3,367
Accumulated other comprehensive income | Cumulative effect of accounting changes        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period $ 0 $ 0 $ 0 $ 10