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Basis of Presentation (Details Textuals) - USD ($) $ in Millions | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total receivable reserves decrease | $ (459) |  | $ (619) | $ (608) |
Offset to retained earnings | $ (12,161) |  | (13,871) |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total loan reserves increase |  | $ 1,663 |  |  |
Total receivable reserves decrease |  | 493 | $ (126) |  | $ (573)
Current and deferred tax impact |  | 288 |  |  |
Offset to retained earnings |  | $ 882 |  |  |

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