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Leases - Supplemental Cash Flow (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash used in operating activities:
Operating leases	$ 30	$ 36
Finance leases	15	15
Cash used in financing activities:
Finance leases	9	6
ROU assets recognized in exchange for lease obligations:
Operating leases	28	99
Finance leases	$ 7	$ 245

X

- Definition

Right-of-Use Asset Obtained in Exchange for Operating Lease Liability [Abstract]

+ References

No definition available.

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X

- Definition

Amount of interest paid on finance lease liability.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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- Definition

Amount of cash outflow for principal payment on finance lease.

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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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Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

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