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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Deferred compensation, accrued vacation and other reserves $ 93 $ 114
Difference between book and tax basis of property 399 436
Pension and other postretirement benefits 62 65
Equity compensation 8 7
Allowance for credit losses 33 168
U.S. Federal net operating loss carryforwards 1,717 1,773
Foreign net operating loss carryforwards 104 112
State net operating loss carryforwards 315 328
Federal and state tax credit carryforwards 393 384
Federal benefit on state uncertain tax positions 5 3
Interest disallowance carryforward per §163(j) of the Tax Act 65 6
Inventory obsolescence 10 9
U.S. capital loss 15 0
Other 22 15
Total deferred tax assets 3,241 3,420
Deferred tax liabilities:    
Emissions allowances 19 20
Derivatives, net 874 591
Goodwill 26 40
Intangibles amortization (excluding goodwill) 269 363
Equity method investments 82 62
Convertible Debt 0 14
Total deferred tax liabilities 1,270 1,090
Total deferred tax assets less deferred tax liabilities 1,971 2,330
Valuation allowance (224) (248)
Net deferred tax asset 1,747 2,082
NRG's net deferred tax position    
Deferred tax asset 1,881 2,155
Deferred tax liability (134) (73)
Net deferred tax asset $ 1,747 $ 2,082