Derivative Instruments - Additional Information (Detail) € in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($) swap	Dec. 31, 2018 USD ($) swap	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 EUR (€) swap	Dec. 31, 2017 EUR (€)
Change in unrealized gain (loss) on anticipated sales hedging:
Gain or loss on contract		$ 13	$ (8)	$ (7)
Foreign currency cash flow hedge derivative | €					€ 496	€ 389
To be amortized through AOCI and subsequently reclassified into interest expense		2
Interest expense		$ 91	227	$ 193
Number of Interest rate swaps | swap	3	3			3
One-time payment classified within Net Cash provided by Operating Activities	$ 7
Derivative instruments designated as hedges
Change in unrealized gain (loss) on anticipated sales hedging:
Derivative, term of contract		12 months
Foreign exchange contracts
Change in unrealized gain (loss) on anticipated sales hedging:
Derivative, increase In gross asset and gross liability, Net	1	$ 1	$ 11
Forward interest rate swaps
Change in unrealized gain (loss) on anticipated sales hedging:
To be amortized through AOCI and subsequently reclassified into interest expense		1
Forward interest rate swaps | Derivative instruments designated as hedges
Change in unrealized gain (loss) on anticipated sales hedging:
Derivative forward long-term interest rate swap	$ 800	800
Interest expense		$ 2