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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%

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: 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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