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Derivatives and Hedging Activities (Details Textuals) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |  |
Margin on interest rate swap not netted | $ 34,000,000 | $ 47,000,000 |
Carrying value of derivative liabilities | 588,000,000 | 341,000,000 |
Net increases (reductions) in interest expense on long term debt and other | (256,000,000) | 102,000,000 | $ 51,000,000
Net gains (losses) related to hedges of investment in foreign operations | (252,000,000) | (140,000,000) |
Income associated with the sale or liquidation of a business | 1,000,000 | 0 | 1,000,000
Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Carrying value of derivative liabilities | 16,400,000,000 | 22,700,000,000 |
Card Member Services Expense [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (loss) in changes of fair value of derivatives not designated as hedges | 10,000,000 | 64,000,000 | 60,000,000
Gain on embedded derivatives | 0 | 3,000,000 |
Loss on embedded derivatives |  |  | 11,000,000
Fair Value Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fixed-rate debt obligations designated in fair value relationships | 15,800,000,000 | 22,600,000,000 |
Cumulative amount of fair value hedging adjustments | 622,000,000 | 217,000,000 |
Net Investment Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional amounts of foreign currency derivatives | 10,500,000,000 | 9,800,000,000 |
Net gains (losses) related to hedges of investment in foreign operations | (252,000,000) | (140,000,000) | $ 328,000,000
Credit Valuation Adjustment [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fixed-rate debt obligations designated in fair value relationships | $ 0 | $ 0 |

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