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Unsecured Debt - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Feb. 28, 2015	May. 31, 2015
Debt Instrument [Line Items]
Weighted average interest rate		0.60%
Export Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 505
Euro-denominated Export Credit Facility
Debt Instrument [Line Items]
Proceeds from credit facility	$ 472
Commercial Paper
Debt Instrument [Line Items]
Short-term borrowings		261
Bank Loans \| Euro-denominated
Debt Instrument [Line Items]
Short-term borrowings		$ 44
Main Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Expiration Period		5 years