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Warranty Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Warranty Obligations [Roll Forward]    
Beginning Balance $ 78 $ 56
Provision charged to income 110 96
Usage (101) (87)
Acquisitions   17
Adjustments to previously provided warranties, net (4) (2)
Currency translation 4 (2)
Ending Balance $ 87 $ 78