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Income Taxes (Provision) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred      
U.S. Federal $ 7 $ (4) $ 28
State 1 (4) 34
Total — deferred 8 (8) 62
Income tax (benefit) expense 8 (8) 62
Reconciliation of the U.S. federal statutory rate to the Company's effective rate from continuing operations      
Income Before Income Taxes (54) (104) 116
Tax at 21% (11) (22) 24
State taxes, net of federal benefit (4) (7) 8
Deferred state rate change due to deconsolidation from NRG 0 0 20
Impact of non-taxable equity earnings 24 24 8
Investment tax credits 0 (1) (3)
Production tax credits, including prior year true-up (1) (1) (1)
Valuation allowance adjustment 0 0 3
Rate Change 2 0 0
Other $ (2) $ (1) $ 3
Effective income tax rate (14.80%) 7.70% 53.40%