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Long-Term Borrowings (Summary of Long-Term Borrowings and Weighted Average Interest Rate) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term borrowings $ 18,033 $ 17,666
Secured Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 13,578 13,773
Secured Debt [Member] | SLC Private Student Loan Trust [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 1,970 2,160
Secured Debt [Member] | Long-Term Borrowings-owed to Securitization Investors [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 15,548 15,933
Secured Debt [Member] | Fixed Rate Asset Backed Securities [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
   
Debt Instrument [Line Items]    
Principal value, including discount 4,699 4,549
Fair value adjustment 3 [1] 6 [1]
Long-term borrowings 4,702 4,555
Interest Rate 2.01% 2.87%
Interest Rate Terms Various fixed rates  
Long term borrowing maturity period Various Feb 2015—July 2019  
Discount 1  
Debt Instrument, Maturity Date Range, Start Feb. 28, 2015  
Debt Instrument, Maturity Date Range, End Jul. 31, 2019  
Secured Debt [Member] | Floating Rate Asset Backed Securities Due 2013 to 2018 [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 8,376 8,468
Interest Rate 0.45% 0.50%
Interest Rate Terms 1-month LIBOR(2) + 8 to 58 basis points [2]  
Long term borrowing maturity period Various July 2013—February 2018  
Debt Instrument, Maturity Date Range, Start Jul. 31, 2013  
Debt Instrument, Maturity Date Range, End Feb. 28, 2018  
Secured Debt [Member] | Floating Rate Asset Backed Securities And Other Borrowings [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 500 750
Interest Rate 0.47% 0.64%
Interest Rate Terms Commercial Paper rate +30 basis points  
Long term borrowing maturity period March 2014  
Secured Debt [Member] | Floating Rate Asset-Backed Securities 3-month LIBOR plus various basis points [Member] | SLC Private Student Loan Trust [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 1,099 1,199
Interest Rate 0.50% 0.56%
Interest Rate Terms 3-month LIBOR(2) + 12 to 45 basis points [2]  
Long term borrowing maturity period Various January 2019— July 2036(3) [3]  
Discount 150  
Debt Instrument, Maturity Date Range, Start Jan. 31, 2019  
Debt Instrument, Maturity Date Range, End Jul. 31, 2036  
Secured Debt [Member] | Floating Rate Asset-Backed Securities Prime Plus 100 Basis Points [Member] | SLC Private Student Loan Trust [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 480 528
Interest Rate 4.25% 4.25%
Interest Rate Terms Prime rate +100 basis points  
Long term borrowing maturity period June 2031(3) [3]  
Discount 3  
Secured Debt [Member] | Floating Rate Asset-Backed Securities Prime Plus 75 Basis Points [Member] | SLC Private Student Loan Trust [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 115 126
Interest Rate 4.00% 4.00%
Interest Rate Terms Prime rate + 75 basis points  
Long term borrowing maturity period July 2042(3) [3]  
Premium 2  
Secured Debt [Member] | Floating Rate Asset-Backed Securities 1-month LIBOR Plus 350 Basis Points [Member] | SLC Private Student Loan Trust [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 276 307
Interest Rate 3.69% 3.71%
Interest Rate Terms 1-month LIBOR(2) + 350 basis points [2]  
Long term borrowing maturity period July 2042(3) [3]  
Premium 4  
Corporate Debt Securities [Member] | Fixed Rate Senior Notes Due 2017 [Member] | Parent Company [Member]
   
Debt Instrument [Line Items]    
Principal value, including discount 400 400
Fair value adjustment 13 [1] 21 [1]
Long-term borrowings 413 421
Interest Rate 6.45% 6.45%
Interest Rate Terms Fixed  
Long term borrowing maturity period June 2017  
Corporate Debt Securities [Member] | Fixed Rate Senior Notes Due 2019 [Member] | Parent Company [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 78 78
Interest Rate 10.25% 10.25%
Interest Rate Terms Fixed  
Long term borrowing maturity period July 2019  
Corporate Debt Securities [Member] | Fixed Rate Senior Notes Due April 2022 [Member] | Parent Company [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 215 211
Interest Rate 5.20% 5.20%
Interest Rate Terms Fixed  
Long term borrowing maturity period April 2022  
Discount 107  
Corporate Debt Securities [Member] | Fixed Rate Senior Notes Due November 2022 [Member] | Parent Company [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 329 324
Interest Rate 3.85% 3.85%
Interest Rate Terms Fixed  
Long term borrowing maturity period November 2022  
Discount 171  
Senior Notes [Member] | Senior Bank Notes Due 2018 [Member] | Discover Bank [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 750 0
Interest Rate 2.00% 0.00%
Interest Rate Terms Fixed  
Long term borrowing maturity period February 2018  
Subordinated Debt [Member] | Subordinated Bank Notes Due 2019 [Member] | Discover Bank [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 200 200
Interest Rate 8.70% 8.70%
Interest Rate Terms Fixed  
Long term borrowing maturity period November 2019  
Subordinated Debt [Member] | Subordinated Bank Notes Due 2020 [Member] | Discover Bank [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings 498 497
Interest Rate 7.00% 7.00%
Interest Rate Terms Fixed  
Long term borrowing maturity period April 2020  
Discount 2  
Capital Lease Obligations [Member]
   
Debt Instrument [Line Items]    
Long-term borrowings $ 2 $ 2
Interest Rate 4.51% 4.51%
Interest Rate Terms Fixed  
Long term borrowing maturity period April 2016  
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member] | Floating Rate Asset-Backed Securities 1-month LIBOR Plus 350 Basis Points [Member] | SLC Private Student Loan Trust [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 3.50%  
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Secured Debt [Member] | Floating Rate Asset Backed Securities Due 2013 to 2018 [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.08%  
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Secured Debt [Member] | Floating Rate Asset-Backed Securities 3-month LIBOR plus various basis points [Member] | SLC Private Student Loan Trust [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.12%  
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Secured Debt [Member] | Floating Rate Asset Backed Securities Due 2013 to 2018 [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.58%  
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Secured Debt [Member] | Floating Rate Asset-Backed Securities 3-month LIBOR plus various basis points [Member] | SLC Private Student Loan Trust [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.45%  
Prime Rate [Member] | Secured Debt [Member] | Floating Rate Asset-Backed Securities Prime Plus 100 Basis Points [Member] | SLC Private Student Loan Trust [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.00%  
Prime Rate [Member] | Secured Debt [Member] | Floating Rate Asset-Backed Securities Prime Plus 75 Basis Points [Member] | SLC Private Student Loan Trust [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.75%  
Commercial Paper Rate [Member] | Minimum [Member] | Secured Debt [Member] | Floating Rate Asset Backed Securities And Other Borrowings [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.30%  
Commercial Paper Rate [Member] | Maximum [Member] | Secured Debt [Member] | Floating Rate Asset Backed Securities And Other Borrowings [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member]
   
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.70%  
[1] The Company uses interest rate swaps to hedge portions of these long-term borrowings against changes in fair value attributable to changes in LIBOR. See Note 15: Derivatives and Hedging Activities.
[2] London Interbank Offered Rate (“LIBOR”).
[3] Repayment of this debt is dependent upon the timing of principal and interest payments on the underlying student loans. The dates shown represent final maturity dates.