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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Supplemental disclosures:
Cash paid for interest	$ 29	$ 16
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	4	4
Operating cash flows from finance leases	1	1
Financing cash flows from finance leases	1	1
Non-cash investing activities:
Change in capital expenditures included in accounts payable	$ 34	$ 13

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Increase (Decrease) in Accounts Payable, Construction in Progress

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Amount of interest paid on finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
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-Section 45
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Amount of cash outflow for principal payment on finance lease.

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-Name Accounting Standards Codification
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-Publisher FASB
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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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