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Leases - Lease-related Assets and Liabilities recorded on the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets
Operating lease assets	$ 38	$ 51
Finance lease assets	170	141
Total lease assets	$ 208	192
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Liabilities
Current portion of operating lease liability	$ 15	20
Current portion of finance lease liability	75	55
Noncurrent portion of operating lease liability	28	38
Noncurrent portion of finance lease liability	70	75
Long-term finance lease obligations	$ 188	$ 188
Weighted-average remaining lease term
Weighted-average remaining lease term, finance leases	3 years 4 months 6 days	3 years 5 months 26 days
Weighted-average remaining lease term, operating leases	2 years 10 days	2 years 5 months 8 days
Weighted-average discount rate
Weighted-average discount rate, operating leases (percentage)	5.00%	5.00%
Weighted-average discount rate, finance leases (percentage)	4.33%	4.58%

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