Revenue Classified by Major Geographic Areas (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Geographic Information [Line Items] | ||||||
| Revenues | $ 28,918 | $ 25,826 | $ 53,456 | $ 47,754 | ||
| United States | ||||||
| Geographic Information [Line Items] | ||||||
| Revenues | [1] | 15,110 | 14,115 | 27,657 | 25,348 | |
| Other Countries | ||||||
| Geographic Information [Line Items] | ||||||
| Revenues | $ 13,808 | $ 11,711 | $ 25,799 | $ 22,406 | ||
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