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Summary of Significant Accounting Policies - Changes in Carrying Amount of Service and Product Warranties (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Product Warranties Disclosures [Abstract]    
Beginning Balance $ 172 $ 244
Net provisions for warranties issued during the year 46 50
Amounts incurred (86) (127)
Currency translation adjustments and other 3 5
Ending Balance $ 135 $ 172