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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% |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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