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Financial Instruments - Credit Losses (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings | $ 176,113 |  | $ 174,945
Allowance for credit loss | 918 |  |
Trade receivable | 8,600 |  |
Non-trade receivable | $ 3,700 |  |
ASU 2016-13 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings |  | $ 25 |

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