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Leases - Lease-Related Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets    
Operating lease assets $ 804 $ 912
Finance lease assets 131 171
Total lease assets $ 935 $ 1,083
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Current:    
Operating lease liabilities $ 113 $ 128
Finance lease liabilities $ 37 $ 31
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term:    
Operating lease liabilities $ 752 $ 690
Finance lease liabilities 26 58
Total lease liabilities $ 928 $ 907
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:LongTermDebtAndCapitalLeaseObligations
Weighted average remaining lease term (in years)    
Operating leases 9 years 11 years
Finance leases 2 years 3 years
Weighted average discount rate    
Operating leases 5.99% 5.95%
Finance leases 4.60% 4.75%