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Consolidations and Transfers of Financial Assets Types of VIE (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Variable Interest Entities [Line Items]  
Investment Tax Credit $ 0
Consolidated VIEs [Member]
 
Variable Interest Entities [Line Items]  
Unpaid principal balance, consolidation of previously unconsolidated VIE 1,900,000,000
Unconsolidated VIEs [Member]
 
Variable Interest Entities [Line Items]  
Unpaid principal balance, deconsolidation of previously consolidated VIE $ 1,200,000,000