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Commitments and Contingencies - Additional Information (Detail) (USD $)	Dec. 31, 2014
Other Commitments [Line Items]
Guarantees of subsidiaries	$ 125,000,000
Outstanding purchase orders	2,900,000,000
Future Minimum Sublease Rentals, Operating Leases, Due Total	9,000,000
Minimum
Other Commitments [Line Items]
Future Minimum Sublease Rentals, Operating Leases, Due Per Year	1,000,000
Maximum
Other Commitments [Line Items]
Future Minimum Sublease Rentals, Operating Leases, Due Per Year	$ 3,000,000

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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