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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Schedule of Other Significant Accounting Policies | The following table identifies our other significant accounting policies, along with the related Note.
Significant Accounting Policy |  | Note Number |  | Note Title
Loans and Card Member Receivables |  | Note 2 |  | Loans and Card Member Receivables
Reserves for Credit Losses |  | Note 3 |  | Reserves for Credit Losses
Investment Securities |  | Note 4 |  | Investment Securities
Asset Securitizations |  | Note 5 |  | Asset Securitizations
Legal Contingencies |  | Note 12 |  | Contingencies and Commitments
Derivative Financial Instruments and Hedging Activities |  | Note 13 |  | Derivatives and Hedging Activities
Fair Value Measurements |  | Note 14 |  | Fair Values
Guarantees |  | Note 15 |  | Guarantees
Income Taxes |  | Note 20 |  | Income Taxes

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