Credit Facilities Schedule of Short term debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Line of Credit Facility [Abstract]
Average daily amount of short-term debt outstanding	$ 63	$ 2	$ 139
Weighted daily average interest rate	5.50%	3.40%	0.90%
Maximum amount outstanding during the year	$ 225	$ 135	$ 230