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Leases, Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
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 $ 1,204 $ 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 $ 285 $ 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 $ 885 $ 959
Operating leases - total lease liabilities $ 1,170 $ 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 $ 1,622 $ 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 $ 120 $ 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 $ 1,544 $ 750
Finance leases - total lease liabilities $ 1,664 $ 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 14 years 6 months 19 years 8 months 12 days
Weighted-average discount rate 4.10% 5.20%