Supplementary Financial Information - Schedule of Other Noncurrent Liabilities and Deferred Credits (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligations [Line Items]
Retirement and other employee benefits	$ 224	$ 247
Winter Storm Uri impacts	1	26
Identifiable intangible liabilities	155	131
Regulatory liability	452	209
Operating lease liabilities	98	48
Finance lease liabilities	218	227
Liability for third-party remediation	8	17
Accrued severance costs	36	36
Other accrued expenses	64	58
Total other noncurrent liabilities and deferred credits	1,256	$ 999
Nuclear Plant Decommissioning - Other Noncurrent Liabilities | Comanche Peak Nuclear Power Plant
Asset Retirement Obligations [Line Items]
Regulatory liability	452
Nuclear Plant Decommissioning - Deferred Credits | Comanche Peak Nuclear Power Plant
Asset Retirement Obligations [Line Items]
Regulatory liability	$ 209