Inventories, Net - Summary of Inventories (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Finished goods and other				$ 531	$ 737	$ 988
Less: inventory reserves	$ (48)	$ (44)	$ (39)	(48)	(44)	(39)
Total				$ 483	$ 693	$ 949
Inventory reserves:
Inventory reserves, Beginning balance	44	39	31
Provision for inventory	36	54	8
Inventory reserves, Charge-offs and other	(32)	(49)
Inventory reserves, Ending balance	$ 48	$ 44	$ 39