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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Deferred compensation, accrued vacation and other reserves $ 79 $ 81
Difference between book and tax basis of property 357 548
Pension and other postretirement benefits 86 86
Equity compensation 10 11
Bad debt reserve 16 13
Derivatives, net 11 0
U.S. Federal net operating loss carryforwards 2,117 2,116
Foreign net operating loss carryforwards 102 105
State net operating loss carryforwards 351 360
Federal and state tax credit carryforwards 384 384
Federal benefit on state uncertain tax positions 4 4
Interest disallowance carryforward per §163(j) of the Tax Act 4 82
Inventory obsolescence 6 7
Other 10 3
Total deferred tax assets 3,537 3,800
Deferred tax liabilities:    
Emissions allowances 21 19
Derivatives, net 0 27
Goodwill 29 8
Intangibles amortization (excluding goodwill) 2 15
Equity method investments 156 201
Convertible Debt 16 19
Total deferred tax liabilities 224 289
Total deferred tax assets less deferred tax liabilities 3,313 3,511
Valuation allowance (266) (242)
Net deferred tax asset 3,047 3,269
NRG's net deferred tax position    
Deferred tax asset 3,066 3,286
Deferred tax liability (19) (17)
Net deferred tax asset $ 3,047 $ 3,269