Summary of Changes in Accumulated Other Comprehensive Income by Component (Parenthetical) (Detail) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Derivatives | ||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||
| Unrealized gains (losses), tax effects | $ 1 | $ 28 |
| Investments | ||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||
| Unrealized gains (losses), tax effects | 182 | (305) |
| Translation adjustments and other | ||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||
| Net current period other comprehensive income (loss), tax effects | $ 7 | $ (12) |