Statement of Cash Flows, Supplemental Disclosures (Tables)

6 Months Ended

Jun. 30, 2020

Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]

Summary of Supplemental Cash Flow Information

	Six Months Ended June 30,
	2020		2019
	(millions)
Cash paid for interest:
Cash paid for interest, net of amounts capitalized	$	149	$	115
Cash paid for income taxes, net of income tax refunds	$	—	$	3
Non-cash investing and financing activities:
Property, plant and equipment acquired with accounts payable and accrued liabilities	$	8	$	37
Other non-cash activities:
Operating lease assets arising from the implementation of Topic 842	$	—	$	84
Right-of-use assets obtained in exchange for operating and finance lease liabilities	$	1	$	6