Intangible Assets (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Intangible assets with definite lives, Total
Gross Carrying Amount	$ 79		$ 79		$ 79
Accumulated Amortization	(35)		(35)		(31)
Net	44		44		48
Intangible Assets with indefinite lives, Total
Gross Carrying Amount	30		30		31
Impairment Charges	0		0		(1)
Net	30		30		30
Estimated annual amortization expense
Estimated annual amortization expense, 2011			8
Estimated annual amortization expense, 2012			8
Estimated annual amortization expense, 2013			7
Estimated annual amortization expense, 2014			7
Estimated annual amortization expense, 2015			7
Estimated annual amortization expense, 2016			7
Intangible Assets (Textuals)
Amortization expense of intangible assets	2	2	4	4
Customer relationships [Member]
Intangible assets with definite lives, Total
Gross Carrying Amount	70		70		70
Accumulated Amortization	(30)		(30)		(26)
Net	40		40		44
Other [Member]
Intangible assets with definite lives, Total
Gross Carrying Amount	9		9		9
Accumulated Amortization	(5)		(5)		(5)
Net	4		4		4
Trade names [Member]
Intangible Assets with indefinite lives, Total
Gross Carrying Amount	22		22		22
Impairment Charges	0		0		0
Net	22		22		22
Other indefinite lived intangible assets [Member]
Intangible Assets with indefinite lives, Total
Gross Carrying Amount	8		8		9
Impairment Charges	0		0		(1)
Net	$ 8		$ 8		$ 8