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Accrued Expenses - Activity in Warranty Accrual for Product Warranty (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance, beginning of the period $ 210us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 289us-gaap_ProductWarrantyAccrualClassifiedCurrent
Provision 33us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 42us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Amounts charged to the accrual (52)us-gaap_StandardProductWarrantyAccrualPayments (57)us-gaap_StandardProductWarrantyAccrualPayments
Balance, end of the period $ 191us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 274us-gaap_ProductWarrantyAccrualClassifiedCurrent