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Employee Separation Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Employee Separation Charges [Roll Forward]
Liability balance at beginning of period		$ 29	$ 90
Increase in liability (separation charges)	34	57	94
Reduction in liability (payments and other adjustments)		(43)	(155)
Liability balance at end of period	$ 43	$ 43	$ 29

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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