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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Supplemental disclosures:
Cash paid for interest	$ 16	$ 2
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	4	3
Operating cash flows from finance leases	1	2
Financing cash flows from finance leases	1	1
Non-cash investing activities:
Change in capital expenditures included in accounts payable	$ 13	$ (6)

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Cash Flow, Lessee [Abstract]

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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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-Publisher FASB
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-Section 45
-Paragraph 5
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Amount of cash outflow for principal payment on finance lease.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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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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