Supplemental Disclosure of Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

The table below provides supplemental disclosure of cash flow information:

	Three Months Ended March 31,
	2018		2017
	(in millions)
Cash Payments:
Interest, net of capitalized interest	$	39	$	29
Non-cash transactions:
Accounts payable related to capital expenditures	$	39	$	28