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Non-Mineral Leases - Balance Sheet (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Property Plant And Equipment Gross $ 97,746,000,000 $ 110,597,000,000
Accumulated depreciation, depletion and amortization 55,477,000,000 64,899,000,000
Property, Plant and Equipment, Net 42,269,000,000 45,698,000,000
Short-term debt 105,000,000 112,000,000
Long-term debt 14,790,000,000 14,856,000,000
Finance Lease, Liability Total 720,000,000  
Prepaid expenses and other current assets 2,259,000,000 575,000,000
Other assets (leases) 2,426,000,000 1,344,000,000
Other Liabilities, Current 2,045,000,000 1,259,000,000
Operating Lease, Liability 932,000,000  
Previously Reported [Member]    
Property Plant And Equipment Gross   1,044,000,000
Accumulated depreciation, depletion and amortization   550,000,000
Property, Plant and Equipment, Net   494,000,000
Short-term debt   79,000,000
Long-term debt   698,000,000
Finance Lease, Liability Total   777,000,000
Accounting Standards Update 2016-02 [Member]    
Property Plant And Equipment Gross 1,039,000,000  
Accumulated depreciation, depletion and amortization 649,000,000  
Property, Plant and Equipment, Net [1] 390,000,000  
Prepaid expenses and other current assets 40,000,000  
Other assets (leases) $ 896,000,000  
Accounting Standards Update 2016-02 [Member] | Restatement Adjustment [Member]    
Operating Lease, Right-of-Use Asset   998,000,000
Operating Lease, Liability, Current   998,000,000
Operating Lease, Liability   $ 998,000,000
[1]
* Includes proportionately
 
consolidated finance lease assets
 
(net of accumulated depreciation,
 
depletion and amortization)
 
of $
335
 
million.