Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2019

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,
	2019
Average daily amount of short-term debt outstanding	$	7
Weighted daily average interest rate *	2.6		%
Maximum amount outstanding during the year	$	46

*

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