Income Taxes Schedule of Deferred tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred income tax assets:
Employee benefits	$ 99	$ 99
Deferred income taxes	21	75
Deferred Tax Assets, tax credits, net of valuation allowance	73	102
Deferred Tax Assets, Derivative Instruments	57	0
Total deferred income tax assets	250	276
Deferred income tax liabilities:
Depreciation and amortization	578	547
Deferred Tax Liabilities, Derivatives	0	54
Regulatory assets	146	101
Deferred Tax Liabilities, Other	14	13
Deferred Tax Liabilities, Gross, Noncurrent	738	715
Total deferred income tax liabilities	$ 488	$ 439