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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, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period     $ 82,718  
Net change related to other comprehensive income (loss) $ 748 $ (754) 989 $ (1,780)
Balance, end of period 94,864 79,239 94,864 79,239
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period 113 21 173 134
Unrealized gains (losses), net of tax 31 15 146 30
Tax expense (benefit) included in provision for income taxes 2 0 7 2
Amounts reclassified from accumulated other comprehensive income (loss) (64) (8) (239) (136)
Net change related to other comprehensive income (loss) (33) 7 (93) (106)
Balance, end of period 80 28 80 28
Derivatives | Revenue        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustments for (gains) losses (66) (8) (246) (138)
Investments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (297) 659 (850) 1,825
Unrealized gains (losses), net of tax 711 (644) 1,267 (961)
Tax expense (benefit) included in provision for income taxes (1) 145 (17) 602
Amounts reclassified from accumulated other comprehensive income (loss) 3 (372) 67 (1,221)
Net change related to other comprehensive income (loss) 714 (1,016) 1,334 (2,182)
Cumulative effect of accounting changes 0 0 (67) 0
Balance, end of period 417 (357) 417 (357)
Investments | Other income (expense), net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustments for (gains) losses 4 (517) 84 (1,823)
Translation adjustments and other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (1,829) (1,079) (1,510) (1,332)
Net change related to other comprehensive income (loss) 67 255 (252) 508
Balance, end of period (1,762) (824) (1,762) (824)
Accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Balance, beginning of period (2,013) (399) (2,187) 627
Net change related to other comprehensive income (loss) 748 (754) 989 (1,780)
Cumulative effect of accounting changes 0 0 (67) 0
Balance, end of period $ (1,265) $ (1,153) $ (1,265) $ (1,153)