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Long-Term Borrowings (Narrative) (Details) (USD $)
6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2012
Fixed Rate Senior Notes Due November 2022 [Member]
Jun. 30, 2012
Fixed Rate Senior Notes Due April 2022 [Member]
Jun. 30, 2013
Parent Company [Member]
Fixed Rate Senior Notes Due November 2022 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2012
Parent Company [Member]
Fixed Rate Senior Notes Due November 2022 [Member]
Corporate Debt Securities [Member]
Jun. 30, 2013
Parent Company [Member]
Fixed Rate Senior Notes Due November 2022 [Member]
Corporate Debt Securities [Member]
May 08, 2012
Parent Company [Member]
Fixed Rate Senior Notes Due April 2022 [Member]
Corporate Debt Securities [Member]
Apr. 27, 2012
Parent Company [Member]
Fixed Rate Senior Notes Due April 2022 [Member]
Corporate Debt Securities [Member]
Jun. 30, 2013
Parent Company [Member]
Fixed Rate Senior Notes Due April 2022 [Member]
Corporate Debt Securities [Member]
Jun. 30, 2012
Parent Company [Member]
Fixed Rate Senior Notes Due April 2022 [Member]
Corporate Debt Securities [Member]
Jun. 30, 2013
Parent Company [Member]
Fixed Rate Senior Notes Due April 2022 [Member]
Corporate Debt Securities [Member]
Jun. 30, 2012
Parent Company [Member]
Fixed Rate Senior Notes Due April 2022 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2012
Parent Company [Member]
Fixed Rate Senior Notes Due April 2022 [Member]
Corporate Debt Securities [Member]
Jun. 30, 2013
Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
Secured Debt [Member]
Dec. 31, 2012
Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
Secured Debt [Member]
Jun. 30, 2013
Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
Floating Rate Asset Backed Securities And Other Borrowings [Member]
Secured Debt [Member]
Dec. 31, 2012
Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
Floating Rate Asset Backed Securities And Other Borrowings [Member]
Secured Debt [Member]
Debt Instrument [Line Items]                                      
Exchange of Debt, Amount, New Notes             $ 500,000,000   $ 14,000,000 $ 308,000,000   $ 322,000,000              
Premium paid on debt exchange 0 114,000,000   176,000,000 115,000,000                            
Amortization of Premium Paid on Debt Exchange           3,000,000   6,000,000     1,000,000 1,000,000 3,000,000 1,000,000          
Total commitment of secured credit facilities                                   7,500,000,000  
Long-term borrowings $ 18,033,000,000   $ 17,666,000,000     $ 329,000,000 $ 324,000,000 $ 329,000,000     $ 215,000,000   $ 215,000,000   $ 211,000,000 $ 13,578,000,000 $ 13,773,000,000 $ 500,000,000 $ 750,000,000