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