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Long-Term Borrowings (Schedule of Long-Term Borrowings and Weighted Average Interest Rates) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
transactions
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]    
Long-term borrowings (in dollars) $ 24,099 $ 22,544
Interest Rate Swaps [Member] | Designated as Hedges [Member] | Fair Value Hedge [Member]    
Debt Instrument [Line Items]    
Interest rate swaps outstanding | transactions 143  
Variable Interest Entity, Primary Beneficiary [Member]    
Debt Instrument [Line Items]    
Long-term borrowings (in dollars) $ 17,190 17,395
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member]    
Debt Instrument [Line Items]    
Long-term borrowings (in dollars) $ 15,899 15,950
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Fixed-Rate Asset-Backed Securities [Member]    
Debt Instrument [Line Items]    
Interest rate minimum 0.69%  
Interest rate maximum 5.65%  
Weighted-average interest rate 1.98%  
Long-term borrowings (in dollars) [1] $ 7,950 8,950
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Fixed-Rate Asset-Backed Securities [Member] | Interest Rate Swaps [Member] | Designated as Hedges [Member] | Fair Value Hedge [Member]    
Debt Instrument [Line Items]    
Interest rate swaps outstanding | transactions 0  
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating-Rate Asset-Backed Securities [Member]    
Debt Instrument [Line Items]    
Interest rate minimum 0.37%  
Interest rate maximum 0.77%  
Weighted-average interest rate 0.54%  
Long-term borrowings (in dollars) [2],[3] $ 7,949 7,000
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating Rate Asset Backed Securities 1-Month LIBOR Plus Various Basis Points [Member]    
Debt Instrument [Line Items]    
Interest rate terms 1-month LIBOR + 18 to 58 basis points  
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating Rate Asset Backed Securities 1-Month LIBOR Plus Various Basis Points [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.18%  
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating Rate Asset Backed Securities 1-Month LIBOR Plus Various Basis Points [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.58%  
Securitized Debt [Member] | Discover Card Master Trust I and Discover Card Execution Note Trust [Member] | Floating Rate Asset Backed Securities 3-Month LIBOR Plus 20 Basis Points [Member]    
Debt Instrument [Line Items]    
Interest rate terms 3-month LIBOR + 20 basis points  
Basis spread on variable rate 0.20%  
Securitized Debt [Member] | SLC Private Student Loan Trust [Member]    
Debt Instrument [Line Items]    
Long-term borrowings (in dollars) $ 1,291 1,445
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating-Rate Asset-Backed Securities [Member]    
Debt Instrument [Line Items]    
Interest rate minimum 0.45%  
Interest rate maximum 4.25%  
Weighted-average interest rate 1.97%  
Long-term borrowings (in dollars) [4],[5],[6],[7] $ 1,291 1,445
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities 3-Month LIBOR Plus Various Basis Points [Member]    
Debt Instrument [Line Items]    
Interest rate terms 3-month LIBOR + 17 to 45 basis points  
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities 3-Month LIBOR Plus Various Basis Points [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.17%  
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities 3-Month LIBOR Plus Various Basis Points [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.45%  
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities Prime Rate Plus 75 to 100 Basis Points [Member]    
Debt Instrument [Line Items]    
Interest rate terms Prime rate + 75 to 100 basis points  
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities Prime Rate Plus 75 to 100 Basis Points [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.75%  
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities Prime Rate Plus 75 to 100 Basis Points [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.00%  
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Floating Rate Asset Backed Securities 1-Month LIBOR Plus 350 Basis Points [Member]    
Debt Instrument [Line Items]    
Interest rate terms 1-month LIBOR + 350 basis points  
Basis spread on variable rate 3.50%  
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Senior Notes Maturing 2031 [Member]    
Debt Instrument [Line Items]    
Long-term borrowings (in dollars) $ 330  
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Senior and Subordinated Notes Maturing 2036 [Member]    
Debt Instrument [Line Items]    
Long-term borrowings (in dollars) 740  
Securitized Debt [Member] | SLC Private Student Loan Trust [Member] | Senior Notes Maturing 2042 [Member]    
Debt Instrument [Line Items]    
Long-term borrowings (in dollars) $ 221  
Corporate Debt Securities [Member] | Parent Company [Member] | Fixed-Rate Senior Notes [Member]    
Debt Instrument [Line Items]    
Interest rate minimum 3.75%  
Interest rate maximum 10.25%  
Weighted-average interest rate 4.75%  
Long-term borrowings (in dollars) [1] $ 2,069 1,558
Senior Notes [Member] | Discover Bank [Member] | Senior Bank Notes [Member]    
Debt Instrument [Line Items]    
Interest rate minimum 2.00%  
Interest rate maximum 4.25%  
Weighted-average interest rate 3.29%  
Long-term borrowings (in dollars) $ 4,142 2,892
Subordinated Debt [Member] | Discover Bank [Member] | Subordinated Bank Notes [Member]    
Debt Instrument [Line Items]    
Interest rate minimum 7.00%  
Interest rate maximum 8.70%  
Weighted-average interest rate 7.49%  
Long-term borrowings (in dollars) $ 698 698
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Interest rate 4.51%  
Weighted-average interest rate 4.51%  
Long-term borrowings (in dollars) $ 0 [8] $ 1
[1] The Company uses interest rate swaps to hedge portions of these long-term borrowings against changes in fair value attributable to changes in London Interbank Offered Rate (“LIBOR”). Use of these interest rate swaps impacts carrying value of the debt. As of June 30, 2015, there were no interest rate swaps outstanding for fixed-rate asset-backed securities. See Note 15: Derivatives and Hedging Activities.
[2] Discover Card Execution Note Trust floating-rate asset-backed securities include issuances with the following interest rate terms: 1-month LIBOR + 18 to 58 basis points and 3-month LIBOR + 20 basis points.
[3] The Company uses interest rate swaps to manage its exposure to changes in interest rates related to future cash flows resulting from interest payments on a portion of these long-term borrowings. There is no impact on debt carrying value from use of these interest rate swaps. See Note 15: Derivatives and Hedging Activities.
[4] Includes $330 million of senior notes maturing in 2031, $740 million of senior and subordinated notes maturing in 2036 and $221 million of senior notes maturing in 2042 as of June 30, 2015.
[5] 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.
[6] SLC Private Student Loan Trusts floating-rate asset-backed securities include issuances with the following interest rate terms: 3-month LIBOR + 17 to 45 basis points, Prime rate + 75 to 100 basis points and 1-month LIBOR + 350 basis points.
[7] The Company acquired an interest rate swap related to the securitized debt assumed in the SLC transaction. The swap does not qualify for hedge accounting and has no impact on debt carrying value. See Note 15: Derivatives and Hedging Activities.
[8] As of June 30, 2015, the outstanding amount of capital lease obligations was not material.