Credit Facilities Schedule of Short term debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Line of Credit Facility [Abstract]
Average daily amount of short-term debt outstanding	$ 2	$ 139	$ 131
Weighted daily average interest rate	3.40%	0.90%	1.50%
Maximum amount outstanding during the year	$ 135	$ 230	$ 225