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Leases, Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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ROU assets, net reflected in the following balance sheet line items: |  |
Operating lease ROU assets, net, balance sheet line item | us-gaap:OtherAssetsNoncurrent | us-gaap:OtherAssetsNoncurrent
Operating leases - deferred charges and other assets, net | $ 1,234 | $ 1,329
Current lease liabilities reflected in the following balance sheet line items: |  |
Current operating lease liabilities, balance sheet line item | us-gaap:AccruedLiabilitiesCurrent | us-gaap:AccruedLiabilitiesCurrent
Operating leases - accrued expenses | $ 301 | $ 331
Noncurrent lease liabilities reflected in the following balance sheet line items: |  |
Noncurrent operating lease liabilities, balance sheet line item | us-gaap:OtherLiabilitiesNoncurrent | us-gaap:OtherLiabilitiesNoncurrent
Operating leases - other long-term liabilities | $ 904 | $ 959
Operating leases - total lease liabilities | $ 1,205 | $ 1,290
ROU assets, net reflected in the following balance sheet line items: |  |
Finance lease ROU assets, net, balance sheet line item | us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization | us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance leases - property, plant, and equipment, net | $ 2,208 | $ 790
Current lease liabilities reflected in the following balance sheet line items: |  |
Current finance lease liabilities, balance sheet line item | us-gaap:DebtCurrent | us-gaap:DebtCurrent
Finance leases - current portion of debt and finance lease obligations | $ 80 | $ 41
Noncurrent lease liabilities reflected in the following balance sheet line items: |  |
Noncurrent finance lease liabilities, balance sheet line item | us-gaap:LongTermDebtAndCapitalLeaseObligations | us-gaap:LongTermDebtAndCapitalLeaseObligations
Finance leases - debt and finance lease obligations, less current portion | $ 2,166 | $ 750
Finance leases - total lease liabilities | $ 2,246 | $ 791
Operating Leases |  |
Weighted-average remaining lease term | 7 years 7 months 6 days | 7 years 8 months 12 days
Weighted-average discount rate | 4.70% | 4.90%
Finance Leases |  |
Weighted-average remaining lease term | 22 years 1 month 6 days | 19 years 8 months 12 days
Weighted-average discount rate | 4.30% | 5.20%

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