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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Benefits and compensation $ 121 $ 120
Regulatory liabilities 378 396
Loss and credit carryforwards 84 76
Asset retirement obligations 95 130
Indexed debt securities derivative 0 36
Investment in unconsolidated affiliates 0 1
Other 49 50
Valuation allowance (10) (11)
Total deferred tax assets 717 798
Deferred tax liabilities:    
Property, plant and equipment 3,228 2,912
Regulatory assets 601 741
Investment in ZENS and equity securities related to ZENS 722 693
Investment in equity securities 0 195
Other 152 161
Total deferred tax liabilities 4,703 4,702
Net deferred tax liabilities 3,986 3,904
Houston Electric    
Deferred tax assets:    
Benefits and compensation 10 13
Regulatory liabilities 184 175
Asset retirement obligations 6 9
Other 13 10
Total deferred tax assets 213 207
Deferred tax liabilities:    
Property, plant and equipment 1,330 1,215
Regulatory assets 112 114
Total deferred tax liabilities 1,442 1,329
Net deferred tax liabilities 1,229 1,122
CERC Corp    
Deferred tax assets:    
Benefits and compensation 9 17
Regulatory liabilities 151 181
Loss and credit carryforwards 466 585
Asset retirement obligations 86 118
Other 25 30
Total deferred tax assets 737 931
Deferred tax liabilities:    
Property, plant and equipment 1,427 1,264
Regulatory assets 381 536
Other 191 159
Total deferred tax liabilities 1,999 1,959
Net deferred tax liabilities $ 1,262 $ 1,028