Income Taxes Schedule of Deferred tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets:
Employee benefits	$ 114	$ 136
Price risk management	0	29
Deferred income taxes	39	23
Deferred Tax Assets, tax credits, net of valuation allowance	98	77
Total deferred income tax assets	251	265
Deferred income tax liabilities:
Depreciation and amortization	536	504
Regulatory assets	121	128
Deferred Tax Liabilities, Other	7	7
Deferred Tax Liabilities, Gross, Noncurrent	664	639
Total deferred income tax liabilities	$ 413	$ 374