Fair Value Disclosure (Tables)

3 Months Ended

Mar. 31, 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 assets and liabilities that are measured at fair value on a recurring basis

			March 31, 2012				December 31, 2011
	Input Level		Carrying Amount		Fair Value		Carrying Amount		Fair Value
			(Dollars in millions)
Assets—Investments securities		3	$	59		59		73		73
Liabilities—Long-term debt excluding capital lease obligations		2		22,056		23,093		21,124		22,052