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Leases - ROU Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets and Liabilities, Lessee [Abstract]    
Finance, ROU assets $ 9 $ 17
Finance, current lease liabilities 9 9
Finance, long-term lease liabilities 0 9
Finance, present value of lease liabilities 9 18
Less amounts reclassified to liabilities subject to compromise (9) 0
Finance Lease, Liability, Net 0 18
Operating, ROU assets $ 29 $ 22
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent
Operating, current lease liabilities $ 27 $ 9
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:OperatingLeaseLiabilityNoncurrent
Operating, long-term lease liabilities $ 2 $ 16
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities us-gaap:OtherLiabilities
Operating, present value of lease liabilities $ 29 $ 25
Less amounts reclassified to liabilities subject to compromise (5) 0
Operating Lease, Liability, Net $ 24 $ 25