v3.20.4
Leases (Supplemental Balance Sheet Information Related to Leases) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Operating Leases    
Operating lease right-of-use assets $ 24,714 $ 24,039
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Accounts payable and accrued liabilities $ 3,537 $ 3,451
Operating lease obligation 22,202 21,804
Total operating lease obligation 25,739 25,255
Finance Leases    
Property, plant and equipment, at cost 3,586 3,534
Accumulated depreciation and amortization (1,361) (1,296)
Property, plant and equipment, net $ 2,225 $ 2,238
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Current portion of long-term debt $ 189 $ 162
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:DebtCurrent us-gaap:DebtCurrent
Long-term debt $ 1,847 $ 1,872
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:LongTermDebtAndCapitalLeaseObligations
Total finance lease obligation $ 2,036 $ 2,034
Weighted-Average Remaining Lease Term (years), Operating leases 8 years 6 months 8 years 4 months 24 days
Weighted-Average Remaining Lease Term (years), Finance leases 9 years 10 months 24 days 10 years 3 months 18 days
Weighted-Average Discount Rate, Operating leases 4.10% 4.20%
Weighted-Average Discount Rate, Finance leases 8.10% 8.40%