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Commitments and Contingencies (Summary of Warranties) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Warranties    
Warranty accrual – January 1 $ 82 $ 99
Net charges for product warranties in the period 7 7
Settlement of warranty claims (9) (12)
Foreign currency and other 1 0
Warranty accrual - March 31 $ 81 $ 94