Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Surrender Value, Fair Value Disclosure	$ 30		$ 30		$ 36
net realized loss	2			$ 4
Long-term Debt	3,286		3,286		3,285
Unamortized Debt Issuance Expense	13		13		14
Long-term Debt, Fair Value	2,831		2,831		$ 3,831
Net gain or loss recognized in the statement of income offset by regulatory accounting	$ 45	$ (114)	(138)	$ (265)
net realized gains			$ 1