Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Cash Flow Elements [Abstract]

Summary of additional information relating to cash flow activities

The following provides additional information relating to cash flow activities:

	Year ended December 31,
	2016			2015			2014
	(in millions)
Cash paid during the year for
Interest—net of interest capitalized	$	144		$	100		$	141
Income taxes—net of refunds	(110		)	435			781
Supplemental disclosure of noncash investing and financing activities:
Change in capitalized expenditures in accounts payable and accrued expenses	(263		)	258			72
Change in capitalized expenditures in other liabilities	(55		)	6			(22		)
Change in noncontrolling interests in other liabilities	8			—			—
Change in accrued share repurchases	—			(29		)	(11		)