Statement of Cash Flows, Supplemental Disclosures (Tables)

9 Months Ended

Sep. 30, 2020

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

Summary of Supplemental Cash Flow Information

	Nine Months Ended September 30,
	2020		2019
	(millions)
Cash paid for interest:
Cash paid for interest, net of amounts capitalized	$	222	$	204
Cash paid for income taxes, net of income tax refunds	$	2	$	3
Non-cash investing and financing activities:
Property, plant and equipment acquired with accounts payable and accrued liabilities	$	5	$	21
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	$	11	$	38