Credit Facilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 850
Debt Instrument, Covenant Description	65.00%
Ratio of Indebtedness to Net Capital	0.562
Commercial Paper, Maximum Term	270 days
FERC Authorized Short-term Debt, effective through February 6, 2014	$ 900
Line of Credit Facility, Amount Outstanding	0
Line of Credit Facility, Remaining Borrowing Capacity	604
letter of credit facility	320
Short-term Debt	146	$ 0
Line of Credit Facility, Current Borrowing Capacity	750
Line of Credit Facility, Current Borrowing Capacity	750
Letters of Credit Outstanding, Amount	$ 106	$ 33