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Warranty Obligations (Details)
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]  
Accrual balance at beginning of period $ 131
Provision for estimated warranties incurred during the period 28
Provision for changes in estimate for pre-existing warranties 8
Settlements made during the period (in cash or in kind) (49)
Accrual balance at end of period 118
Minimum | Product Warranty  
Product Warranty Liability [Line Items]  
Range of Possible Loss, Portion Not Accrued 0
Maximum | Product Warranty  
Product Warranty Liability [Line Items]  
Range of Possible Loss, Portion Not Accrued $ 40