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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period     $ 118,304  
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201601Member us-gaap:AccountingStandardsUpdate201601Member us-gaap:AccountingStandardsUpdate201601Member us-gaap:AccountingStandardsUpdate201601Member
Net change related to other comprehensive income (loss) $ (1,905) $ 2,931 $ (1,734) $ 3,016
Balance, end of period 134,505 114,501 134,505 114,501
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (26) (6) (38) 0
Unrealized gains (losses), net of tax (2) (46) 43 (50)
Tax expense (benefit) included in provision for income taxes (6) (2) 2 (1)
Amounts reclassified from accumulated other comprehensive income (loss) 20 10 (13) 8
Net change related to other comprehensive income (loss) 18 (36) 30 (42)
Balance, end of period (8) (42) (8) (42)
Derivatives | Revenue        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustments for (gains) losses included in earnings 26 12 (15) 9
Investments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period 4,795 1,645 5,478 1,488
Unrealized gains (losses), net of tax (1,696) 3,504 (2,361) 3,666
Tax expense (benefit) included in provision for income taxes 2 (1) 10 0
Amounts reclassified from accumulated other comprehensive income (loss) (9) 4 (37) (1)
Net change related to other comprehensive income (loss) (1,705) 3,508 (2,398) 3,665
Balance, end of period 3,090 5,153 3,090 5,153
Investments | Cumulative effect of accounting changes        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period 0 0 10 0
Investments | Other Income (Expense), Net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustments for (gains) losses included in earnings (11) 5 (47) (1)
Translation adjustments and other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (1,402) (1,894) (2,254) (1,828)
Net change related to other comprehensive income (loss) (218) (541) 634 (607)
Balance, end of period (1,620) (2,435) (1,620) (2,435)
Accumulated other comprehensive income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period 3,367 (255) 3,186 (340)
Net change related to other comprehensive income (loss) (1,905) 2,931 (1,734) 3,016
Balance, end of period 1,462 2,676 1,462 2,676
Accumulated other comprehensive income | Cumulative effect of accounting changes        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period $ 0 $ 0 $ 10 $ 0