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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.

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