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Leases - Other Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Lessee, Lease, Description [Line Items] |  |
Operating cash flows for operating leases | $ 108 | $ 116
Operating cash flows for finance leases | 5 | 1
Financing cash flows for finance leases | 19 | 18
Non-cash change in lease liabilities arising from obtaining new right of use assets or modifications, operating leases | 5 | 77
Non-cash change in lease liabilities arising from obtaining new right of use assets or modifications, finance leases | $ 32 | $ 27
Weighted-average remaining lease term (in years): |  |
Operating lease, weighted-average lease term | 12 years | 11 years
Finance lease, weighted-average lease term | 9 years | 6 years
Weighted-average discount rate: |  |
Operating lease, weighted-average discount rate | 4.50% | 4.40%
Finance lease, weighted-average discount rate | 11.10% | 7.10%
Equity Method Investees | Agreement to store at facilities owned by equity method investee |  |
Lessee, Lease, Description [Line Items] |  |
Non-cash change in lease liabilities arising from obtaining new right of use assets or modifications, finance leases | $ 25 | $ 12
Ownership interest in unconsolidated entity | 50.00% |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Amount of interest paid on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918643-209977 + Details
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