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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
U.S. Federal net operating loss carryforwards $ 1,477 $ 1,762
State net operating loss carryforwards 341 367
Foreign net operating loss carryforwards 106 110
Deferred revenues 335 347
Difference between book and tax basis of property 322 353
Federal and state tax credit carryforwards 269 317
Deferred compensation, accrued vacation and other reserves 174 141
Interest disallowance carryforward per §163(j) of the Tax Act 77 132
Pension and other postretirement benefits 46 48
Allowance for credit losses 37 35
Equity compensation 30 24
Federal benefit on state uncertain tax positions 13 13
Inventory obsolescence 13 11
U.S. capital loss 1 1
Other 46 33
Total deferred tax assets 3,287 3,694
Deferred tax liabilities:    
Intangibles amortization (excluding goodwill) 486 726
Derivatives 193 156
Capitalized contract costs 249 131
Equity method investments 88 93
Goodwill 56 40
Debt discount amortization 0 26
Emissions allowances 16 18
Total deferred tax liabilities 1,088 1,190
Total deferred tax assets less deferred tax liabilities 2,199 2,504
Valuation allowance (144) (275)
Net deferred tax asset 2,055 2,229
NRG's net deferred tax position    
Deferred tax asset 2,067 2,251
Deferred tax liability (12) (22)
Net deferred tax asset $ 2,055 $ 2,229