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Consolidations and Transfers of Financial Assets Types of VIE (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Consolidated VIEs [Member]
 
Variable Interest Entities [Line Items]  
Unpaid principal balance, consolidation of previously unconsolidated VIE $ 973
Unconsolidated VIEs [Member]
 
Variable Interest Entities [Line Items]  
Unpaid principal balance, deconsolidation of previously consolidated VIE $ 0