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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Deferred compensation, accrued vacation and other reserves | $ 81 | $ 134
Difference between book and tax basis of property | 548 | 554
Goodwill | 0 | 11
Differences between book and tax basis of contracts | 0 | 38
Pension and other postretirement benefits | 86 | 87
Equity compensation | 11 | 9
Bad debt reserve | 13 | 14
U.S. Federal net operating loss carryforwards | 2,116 | 2,241
Foreign net operating loss carryforwards | 105 | 63
State net operating loss carryforwards | 360 | 379
Federal and state tax credit carryforwards | 384 | 381
Federal benefit on state uncertain tax positions | 4 | 6
Intangibles amortization (excluding goodwill) | 0 | 21
Interest disallowance carryforward per §163(j) of the Tax Act | 82 | 102
Inventory obsolescence | 7 | 7
Other | 3 | 0
Discontinued operations | 0 | 17
Total deferred tax assets | 3,800 | 4,064
Net deferred tax liability |  | (19)
Deferred Tax Liabilities, Gross [Abstract] |  |
Emissions allowances | 19 | 15
Derivatives, net | 27 | 37
Goodwill | 8 | 0
Intangibles amortization (excluding goodwill) | 15 | 0
Equity method investments | 201 | 180
Convertible Debt | 19 | 21
Deferred Tax Liabilities, Other | 0 | 1
Discontinued operations | 0 | 36
Deferred Tax Liabilities, Gross, Total | 289 | 290
Total deferred tax assets less deferred tax liabilities | 3,511 | 3,774
Valuation allowance | (242) | (3,812)
Discontinued operations | 0 | 19
Net deferred tax asset | 3,269 |
Net deferred tax liability |  | (19)
NRG's net deferred tax position |  |
Deferred tax asset | 3,286 | 46
Deferred tax liability | (17) | (65)
Deferred tax asset | $ 3,269 |
Net deferred tax liability |  | $ (19)

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from differences between the book and tax basis of contracts, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from deferred financing costs, which can only be deducted for tax purposes when relevant losses are realized or actual obligations are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
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