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Acquisitions and Dispositions (MetLife Bank Disposition - Narrative) (Details) (MetLife Bank [Member], USD $)
3 Months Ended
Mar. 31, 2013
Jan. 11, 2013
Mar. 31, 2012
Mar. 31, 2013
Minimum [Member]
Mar. 31, 2013
Maximum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Assets related to sale of business   $ 6,400,000,000      
Net consideration paid   6,400,000,000      
Gain (loss) on disposal (59,000,000)   7,000,000    
Additional charges expected related to the exit of business       $ 80,000,000 $ 105,000,000