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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, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]    
Beginning Balance $ 272 $ 228
Net provisions for warranties issued during the year 92 123
Amounts incurred (117) (78)
Currency translation adjustments and other (3) (1)
Ending Balance $ 244 $ 272