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Acquisitions and Dispositions (Restructuring Charges - Narrative) (Details) (Investments in Foreign Subsidiaries and Foreign Corporate Joint Ventures that are Essentially Permanent in Duration [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Nov. 01, 2010
Investments in Foreign Subsidiaries and Foreign Corporate Joint Ventures that are Essentially Permanent in Duration [Member]
Valuation Allowance [Line Items]
Deferred tax asset valuation allowance associated with branch restructuring	$ 0	$ 25
Liability recognized in purchase accounting for the anticipated and estimated costs associated with restructuring foreign branches into subsidiaries	$ 48		$ 277

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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