Intangible Assets

9 Months Ended

Sep. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets Disclosure [Text Block]

Intangible Assets

Intangible assets are included in other assets on the condensed consolidated balance sheets. Intangible assets with definite lives are amortized. These assets are summarized as follows:

	As of September 30, 2012							As of December 31, 2011
(millions)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Intangible Assets with Definite Lives:
Customer relationships	$	70	$	(39	)	$	31	$	70	$	(34	)	$	36
Other	9		(6		)	3		9		(5		)	4
Total	$	79	$	(45	)	$	34	$	79	$	(39	)	$	40

Total amortization expense was $2 million and $6 million for the third quarter and first nine months of 2012, respectively, and $2 million and $6 million for the third quarter and first nine months of 2011, respectively. Estimated amortization expense for the remainder of 2012 and for future years is as follows:

(millions)	2012		2013		2014		2015		2016		2017 and thereafter
Estimated future amortization expense	$	2	$	7	$	7	$	7	$	7	$	4

Intangible assets with indefinite lives are not amortized. These assets are summarized as follows:

	As of September 30, 2012						As of December 31, 2011
(millions)	Gross Carrying Amount		Impairment Charges		Net		Gross Carrying Amount		Impairment Charges		Net
Intangible Assets with Indefinite Lives:
Trade names	$	22	$	—	$	22	$	22	$	—	$	22
Other	8		—		8		8		—		8
Total	$	30	$	—	$	30	$	30	$	—	$	30