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Commitments and Contingencies Warranty Reserve Activity (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Movement in Standard Product Warranty Accrual [Roll Forward]      
Beginning balance at January 1 $ 8us-gaap_StandardProductWarrantyAccrual $ 8us-gaap_StandardProductWarrantyAccrual $ 6us-gaap_StandardProductWarrantyAccrual
Accruals for warranties issued 16us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 15us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 17us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Settlements (in cash or kind) (17)us-gaap_StandardProductWarrantyAccrualPayments (15)us-gaap_StandardProductWarrantyAccrualPayments (15)us-gaap_StandardProductWarrantyAccrualPayments
Balance at end of period $ 7us-gaap_StandardProductWarrantyAccrual $ 8us-gaap_StandardProductWarrantyAccrual $ 8us-gaap_StandardProductWarrantyAccrual