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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, 2018
Dec. 31, 2017
Product Warranties Disclosures [Abstract]    
Beginning Balance $ 135 $ 172
Net provisions for warranties issued during the year 38 46
Amounts incurred (67) (86)
Currency translation adjustments (1) 3
Ending Balance $ 105 $ 135