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v3.20.2

Basis of Presentation (Details Textuals) - USD ($) $ in Millions | Jan. 01, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |
Total receivable reserves decrease |  | $ 519 |  | $ 619 |  |  |
Shareholders' equity |  | 21,062 | $ 21,006 | 23,071 | $ 23,092 | $ 22,218 | $ 22,290
Retained Earnings [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Shareholders' equity |  | $ 12,052 | $ 12,161 | 13,871 | $ 13,551 | $ 12,686 | $ 12,499
Cumulative effect of change in accounting principle - Reserve for Credit Losses |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Total loan reserves increase | $ 1,663 |  |  |  |  |  |
Total receivable reserves decrease | (493) |  |  |  |  |  |
Current and deferred tax impact | 288 |  |  |  |  |  |
Shareholders' equity |  |  |  | (882) |  |  |
Cumulative effect of change in accounting principle - Reserve for Credit Losses | Retained Earnings [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Shareholders' equity | $ (882) |  |  | $ (882) |  |  |

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