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Summary of Significant Accounting Policies - Recently Issued and Adopted Accounting Standards (Details) - USD ($) $ in Millions | Jan. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Shareholders' equity |  |  | $ (22,984) | $ (23,071) |  | $ (22,290) | $ (18,261)
Retained Earnings [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Shareholders' equity |  |  | (13,837) | (13,871) |  | (12,499) | (8,307)
Card Member Receivables [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Receivable reserves |  |  | $ (267) | (619) |  | $ (573) | $ (521)
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Current and deferred tax impact |  | $ 288 |  |  |  |  |
Shareholders' equity | [1] |  |  | 882 |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Shareholders' equity |  | 882 |  | 882 | [1] |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Total Loans [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Increase in financing receivable, allowance |  | 1,663 |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Card Member Receivables [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Increase in financing receivable, allowance |  | (493) |  |  |  |  |
Receivable reserves |  | $ 493 |  | $ (126) |  |  |
[1] | Represents $1,170 million, net of tax of $288 million, related to the impact as of January 1, 2020 of adopting the new accounting guidance for the recognition of credit losses on certain financial instruments.

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