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Leases - Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Assets and Liabilities [Line Items]    
Long-term operating lease right-of-use assets, net $ 378 $ 466
Finance lease right-of-use assets, gross 141 124
Finance lease right-of-use assets, accumulated depreciation (27) (16)
Finance lease right-of-use assets, net $ 114 $ 108
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentNet
Total lease right-of-use assets $ 492 $ 574
Operating lease liabilities    
Operating lease liabilities, current $ 78 $ 94
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent
Long-term operating lease liabilities $ 317 $ 387
Total operating lease liabilities 395 481
Finance lease liabilities    
Finance lease liabilities, current $ 11 $ 18
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:DebtCurrent us-gaap:DebtCurrent
Finance lease liabilities, noncurrent $ 70 $ 49
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLongTermDebtNoncurrent us-gaap:OtherLongTermDebtNoncurrent
Total finance lease liabilities $ 81 $ 67
Total lease liabilities 476 548
Equity Method Investees | Agreement to store at facilities owned by equity method investee    
Lessee, Lease, Assets and Liabilities [Line Items]    
Finance lease right-of-use assets, net 35 12
Finance lease liabilities    
Total finance lease liabilities $ 36 $ 12
Ownership interest in unconsolidated entity 50.00%