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Leases - Lessee (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease, Cost [Abstract]    
Operating leases $ 55 $ 136
Short-term and variable leases 101 92
Total lease cost(a) 156 228
Lease Costs Capitalized 25 46
Lessee, Operating Lease, Description [Abstract]    
Operating cash flows from operating leases (131) (182)
Investing cash flows from operating leases (25) (46)
ROU assets obtained in exchange for operating lease obligations, net of retirements adjusted for currency conversion 20 399
Amortization of ROU assets $ 46 $ 75
Weighted average remaining lease term 11 years 6 months 21 days 13 years 4 months 24 days
Weighted average discount rate 4.27% 4.31%
Assets and Liabilities, Lessee [Abstract]    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent us-gaap:OtherAssetsNoncurrent
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherAccruedLiabilitiesCurrent us-gaap:OtherAccruedLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:DeferredCreditsAndOtherLiabilitiesNoncurrent us-gaap:DeferredCreditsAndOtherLiabilitiesNoncurrent
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentNet
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:LongTermDebtNoncurrent us-gaap:LongTermDebtNoncurrent
ROU assets $ 303 $ 329
Short-term lease liability 40 40
Long-term lease liability 263 289
Finance lease assets 1 2
Finance lease liabilities 1 2
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
2021 53  
2022 46  
2023 38  
2024 34  
2025 30  
Thereafter 211  
Total lease payments 412  
Less: Interest (109)  
Present value of lease liabilities 303  
KML and U.S. Portion of Cochin Pipeline System    
Lessee, Operating Lease, Description [Abstract]    
Removal of ROU assets and liabilities associated with the KML and U.S. Cochin Sale 0 (394)
Amount Excluding Cumulative Adjustment    
Lessee, Operating Lease, Description [Abstract]    
ROU assets obtained in exchange for operating lease obligations, net of retirements adjusted for currency conversion $ 20 $ 102