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Risk Management and Derivatives - Additional Information (Detail) (USD $)
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9 Months Ended |
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Feb. 28, 2014
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| Derivative Instruments and Hedging Activities Disclosure [Line Items] |
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| Total notional amount of outstanding derivatives |
$ 12,000,000,000 |
| Maximum term over which the Company is hedging exposures to the variability of cash flows for its forecasted and recorded transactions (in months) |
24 months |
| Percentage of anticipated exposures hedged (percent) |
100.00% |
| Deferred net gains (net of tax) on both outstanding and matured derivatives accumulated in other comprehensive income are expected to be reclassified to net income during the next twelve months as a result of underlying hedged transactions also being recorded in net income |
7,000,000 |
| Aggregate fair value of derivative instruments in net liability position |
46,000,000 |
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Embedded derivatives
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| Derivative Instruments and Hedging Activities Disclosure [Line Items] |
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| Total notional amount of outstanding derivatives |
112,000,000 |
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Minimum
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| Derivative Instruments and Hedging Activities Disclosure [Line Items] |
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| Typical time period that anticipated exposures are hedged against (in months) |
12 months |
| Minimum fair value of outstanding derivative above which the credit related contingent features require the derivative party to post collateral |
$ 50,000,000 |
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Maximum
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| Derivative Instruments and Hedging Activities Disclosure [Line Items] |
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| Typical time period that anticipated exposures are hedged against (in months) |
18 months |