Notional Amounts of Outstanding Derivative Instruments (Detail) - USD ($) $ in Millions |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Net Investment Hedges | ||
| Derivative [Line Items] | ||
| Notional amount | $ 864 | $ 864 |
| Interest Rate Swaps | ||
| Derivative [Line Items] | ||
| Notional amount | 7,620 | 7,620 |
| Forward Interest Rate Swaps | ||
| Derivative [Line Items] | ||
| Notional amount | 2,000 | 750 |
| Cross Currency Swaps | ||
| Derivative [Line Items] | ||
| Notional amount | $ 9,675 | $ 9,675 |