Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2022

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,
	2022			2021			2020
Average daily amount of short-term debt outstanding	$	2		$	139		$	131
Weighted daily average interest rate *	3.4		%	0.9		%	1.5		%
Maximum amount outstanding during the year	$	135		$	230		$	225

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