Selected Balance Sheet Data Balance Sheet Related Disclosures, Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024
Balance Sheet Related Disclosures [Abstract]
Electric plant		$ 11,588	$ 11,443
Plant to be retired	[1]	175	182
CWIP		658	518
Total property, plant and equipment		12,421	12,143
Less accumulated depreciation		(2,947)	(2,892)
Property, plant and equipment, net		$ 9,474	$ 9,251

[1] Amounts include Tolk Unit 1 and 2. Amounts are reported net of accumulated depreciation.