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Leases - Schedule of Lease Assets and Lease Liabilities and their Balance Sheet Locations (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Lease assets:    
Operating lease right-of-use assets $ 236 $ 294
Finance lease assets $ 69 $ 58
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentNet
Total lease assets $ 305 $ 352
Current:    
Operating lease liabilities $ 57 $ 66
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Finance lease liabilities $ 7 $ 5
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:DebtCurrent us-gaap:DebtCurrent
Total current lease liabilities $ 64 $ 71
Non-current:    
Operating lease liabilities 194 245
Finance lease liabilities $ 67 $ 54
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtNoncurrent us-gaap:LongTermDebtNoncurrent
Total non-current lease liabilities $ 261 $ 299
Total lease liabilities $ 325 $ 370