Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Interest expense	$ 149	$ 86	$ 282	$ 168
Operating Segments
Segment Reporting Information [Line Items]
Interest income	6	6	12	11
Interest expense	$ 13	$ 7	$ 26	$ 12