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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Deferred compensation, accrued vacation and other reserves | $ 114 | $ 79
Difference between book and tax basis of property | 436 | 357
Pension and other postretirement benefits | 65 | 86
Equity compensation | 7 | 10
Bad debt reserve | 168 | 16
Derivatives, net | 0 | 11
U.S. Federal net operating loss carryforwards | 1,773 | 2,117
Foreign net operating loss carryforwards | 112 | 102
State net operating loss carryforwards | 328 | 351
Federal and state tax credit carryforwards | 384 | 384
Federal benefit on state uncertain tax positions | 3 | 4
Interest disallowance carryforward per §163(j) of the Tax Act | 6 | 4
Inventory obsolescence | 9 | 6
Other | 15 | 10
Total deferred tax assets | 3,420 | 3,537
Deferred tax liabilities: |  |
Emissions allowances | 20 | 21
Derivatives, net | 591 | 0
Goodwill | 40 | 29
Intangibles amortization (excluding goodwill) | 363 | 2
Equity method investments | 62 | 156
Convertible Debt | 14 | 16
Total deferred tax liabilities | 1,090 | 224
Total deferred tax assets less deferred tax liabilities | 2,330 | 3,313
Valuation allowance | (248) | (266)
Net deferred tax asset | 2,082 | 3,047
NRG's net deferred tax position |  |
Deferred tax asset | 2,155 | 3,066
Deferred tax liability | (73) | (19)
Net deferred tax asset | $ 2,082 | $ 3,047

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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 pension and other post retirement costs, which can only be deducted for tax purposes when actual costs 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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