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Restructuring Restructuring Charges by Type of Cost (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 3	$ 0	$ 3	$ 25
Termination Benefits Member
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1	0	1	4
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 2	$ 0	$ 2	$ 21

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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