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Commitments and Contingencies (Schedule of Product Warranty Reserves) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 $ 235us-gaap_ProductWarrantyAccrual $ 191us-gaap_ProductWarrantyAccrual
Issuances/accruals during the period 62us-gaap_ProductWarrantyAccrualWarrantiesIssued 63us-gaap_ProductWarrantyAccrualWarrantiesIssued
Settlements made during the period (75)us-gaap_ProductWarrantyAccrualPayments (74)us-gaap_ProductWarrantyAccrualPayments
Balance at March 31 222us-gaap_ProductWarrantyAccrual 180us-gaap_ProductWarrantyAccrual
Current portion 172us-gaap_ProductWarrantyAccrualClassifiedCurrent 143us-gaap_ProductWarrantyAccrualClassifiedCurrent
Non-current portion 50us-gaap_ProductWarrantyAccrualNoncurrent 37us-gaap_ProductWarrantyAccrualNoncurrent
Total $ 222us-gaap_ProductWarrantyAccrual $ 180us-gaap_ProductWarrantyAccrual