Selected Balance Sheet Data Balance Sheet Related Disclosures, Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions		Sep. 30, 2024	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Electric plant		$ 11,141	$ 10,752
Plant to be retired	[1]	189	248
CWIP		546	226
Total property, plant and equipment		11,876	11,226
Less accumulated depreciation		(2,882)	(2,690)
Property, plant and equipment, net		$ 8,994	$ 8,536

[1] Amounts include Tolk and coal generation assets at Harrington pending facility gas conversion. Amounts are reported net of accumulated depreciation.