Supplemental Cash Flow Information

12 Months Ended

Dec. 31, 2016

Supplemental Cash Flow Information [Abstract]

Supplemental Cash Flow Information

20. Supplemental Cash Flow Information

	Year Ended December 31,
	2016		2015		2014
	(in millions)
Interest paid on outstanding debt	$	162	$	182	$	176
Income tax payments	$	120	$	132	$	129
Income tax refunds	$	8	$	8	$	9