Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2023

Line of Credit Facility [Abstract]

Schedule of Short-term Debt [Table Text Block]

Short-term borrowings under these credit facilities, and related interest rates, are reflected in the following table (dollars in millions).

	Year Ended December 31,
	2023			2022			2021
Average daily amount of short-term debt outstanding	$	63		$	2		$	139
Weighted daily average interest rate *	5.5		%	3.4		%	0.9		%
Maximum amount outstanding during the year	$	225		$	135		$	230

*    Excludes the effect of commitment fees, facility fees, and other financing fees.