Fair Value Disclosure (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

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

The three input levels in the hierarchy of fair value measurements are defined by the FASB generally as follows:

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 level to determine fair values

The following table presents the carrying amounts and estimated fair values of our long-term debt, excluding capital lease obligations, as well as the input level used to determine the fair values:

		September 30, 2013			December 31, 2012
	Input Level	Carrying Amount		Fair Value	Carrying Amount	Fair Value
	(Dollars in millions)
Liabilities—Long-term debt, excluding capital lease obligations	2	$	19,929	20,124	19,871	21,457