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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Benefits and compensation $ 126 $ 131
Regulatory liabilities 348 365
Loss and credit carryforwards 942 76
Asset retirement obligations 98 96
Other 150 124
Valuation allowance (35) (10)
Total deferred tax assets 1,629 782
Deferred tax liabilities:    
Property, plant and equipment 4,384 3,580
Regulatory assets 750 401
Investment in ZENS and equity securities related to ZENS 866 788
Other 18 92
Total deferred tax liabilities 6,018 4,861
Net deferred tax liabilities 4,389 4,079
Houston Electric    
Deferred tax assets:    
Benefits and compensation 8 10
Regulatory liabilities 158 176
Loss and credit carryforwards 408 0
Asset retirement obligations 9 6
Other 16 18
Total deferred tax assets 599 210
Deferred tax liabilities:    
Property, plant and equipment 1,988 1,497
Regulatory assets 113 119
Total deferred tax liabilities 2,101 1,616
Net deferred tax liabilities 1,502 1,406
CERC    
Deferred tax assets:    
Benefits and compensation 17 21
Regulatory liabilities 150 145
Loss and credit carryforwards 694 276
Asset retirement obligations 82 86
Other 122 65
Valuation allowance (25) 0
Total deferred tax assets 1,040 593
Deferred tax liabilities:    
Property, plant and equipment 1,883 1,602
Regulatory assets 513 171
Other 14 66
Total deferred tax liabilities 2,410 1,839
Net deferred tax liabilities $ 1,370 $ 1,246