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Commitments and Contingencies - Warranty Reserve Activity (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]    
Beginning balance at January 1 $ 7us-gaap_StandardProductWarrantyAccrual $ 8us-gaap_StandardProductWarrantyAccrual
Provisions for warranties issued 2us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 3us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Settlements (in cash or in kind) (3)us-gaap_StandardProductWarrantyAccrualPayments (4)us-gaap_StandardProductWarrantyAccrualPayments
Balance at March 31 $ 6us-gaap_StandardProductWarrantyAccrual $ 7us-gaap_StandardProductWarrantyAccrual