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Non-Mineral Leases - End Notes (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment, Net $ 44,334 $ 45,698
Short-term Lease Commitment, Amount 77  
Short Term Lease Commitment Lease Not Commenced 65  
Property plant equipment | Corporate Joint Venture [Member]    
Property, Plant and Equipment, Net 376  
Short term debt | Corporate Joint Venture [Member]    
Finance Lease, Liability, Current $ 55  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Debt, Current  
Long-term Debt | Corporate Joint Venture [Member]    
Finance Lease, Liability, Noncurrent $ 609  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-term Debt and Capital Lease Obligations