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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)