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
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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]
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Debt Instrument [Line Items] | ||||||||||
Long-term borrowings | 13,578 | 13,773 | ||||||||
Secured Debt [Member] | SLC Private Student Loan Trust [Member]
|
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Debt Instrument [Line Items] | ||||||||||
Long-term borrowings | 1,970 | 2,160 | ||||||||
Secured Debt [Member] | Long-Term Borrowings-owed to Securitization Investors [Member]
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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]
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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]
|
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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]
|
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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]
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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]
|
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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]
|
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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]
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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]
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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]
|
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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]
|
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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]
|
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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]
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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]
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||||||||||
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]
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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]
|
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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]
|
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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]
|
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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]
|
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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]
|
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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]
|
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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]
|
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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]
|
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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% | |||||||||
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