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Other Expenses (Other Restructuring Charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Restructuring Charges
Balance, beginning of period	$ 23	$ 0
Restructuring charges	33	27
Cash payments	(36)	0
Balance, end of period	20	27
Total restructuring charges incurred since inception of initiative	$ 192	$ 27

Amount of costs incurred to date for the specified type of restructuring cost.

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- Definition

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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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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