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Securitizations And Variable Interest Entities (Schedule Of Cash Flow Received and Paid To Nonconsolidated Securitization Entities) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Consumer Loans Auto Financing Receivable [Member]
       
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale   $ 0   $ 6
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers     0 1,978
Cash flows received on retained interests in securitization entities       0
Cash Flows Between Transferor and Transferee, Servicing Fees     10 8
Purchases of previously transferred financial assets       0
Representations and warranties obligations     0 0
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other     0 0
US Government-sponsored Enterprises [Member]
       
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]        
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale 0 19 112 71
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers     8,676 23,779
Cash flows received on retained interests in securitization entities       0
Cash Flows Between Transferor and Transferee, Servicing Fees     68 560
Purchases of previously transferred financial assets       (876)
Representations and warranties obligations     (65) (105)
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other     70 (91)
Private Placement [Member]
       
Cash Flow Received and Paid to Nonconsolidated Securitization Entities [Line Items]        
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers     0 5
Cash flows received on retained interests in securitization entities       71
Cash Flows Between Transferor and Transferee, Servicing Fees     0 63
Purchases of previously transferred financial assets       (12)
Representations and warranties obligations     0 (7)
Cash Flows Between Transferor and Transferee, Receipts on Transferor's Interest in Transferred Financial Assets, Other     $ 0 $ 255