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Income Taxes - Deferred Tax Assets and Liabilities Table (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax liabilities: |  |
Property, plant and equipment | $ (546) | $ (976)
Volumetric production payments | (89) | (86)
Carrying value of debt | 0 | (95)
Derivative instruments | (14) | (56)
Other | (5) | (7)
Deferred tax liabilities | (654) | (1,220)
Deferred tax assets: |  |
Net operating loss carryforwards | 1,971 | 2,737
Carrying value of debt | 169 | 0
Disallowed business interest carryforward | 25 | 194
Asset retirement obligations | 50 | 40
Investments | 83 | 111
Accrued liabilities | 64 | 89
Other | 87 | 60
Deferred tax assets | 2,449 | 3,231
Valuation allowance | (1,805) | (2,011)
Deferred tax assets after valuation allowance | 644 | 1,220
Net deferred tax liability | $ (10) | $ 0

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