Fair Value Disclosure (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Disclosure

Schedule of the three input levels in the hierarchy of fair value measurements

Input Level	Description of Input
Level 1	Observable inputs such as quoted market prices in active markets.
Level 2	Inputs other than quoted prices in active markets that are either directly or indirectly observable.
Level 3	Unobservable inputs in which little or no market data exists.

Schedule of carrying amounts and estimated fair values of long-term debt, excluding capital lease obligations, and input levels to determine fair values

		September 30, 2012				December 31, 2011
	Input Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
		(Dollars in millions)
Assets—Investment securities	3	$	19		19		73		73
Liabilities—Long-term debt excluding capital lease obligations	2		19,939		21,683		21,124		22,052