Revolving Credit Facilities (Tables)

12 Months Ended

Dec. 31, 2012

Revolving Credit Facilities [Abstract]

Schedule of Short-term Debt [Table Text Block]

Short-term borrowings under these credit facilities and related interest rates were as follows (dollars in millions):

	Years Ended December 31,
	2012		2011		2010
Average daily amount of short-term debt outstanding	4		2		9
Weighted daily average interest rate *	0.4	%	0.4	%	0.4	%
Maximum amount outstanding during the year	44		44		51

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