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Financial Instruments - Credit Losses (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Receivables [Abstract] |  |
Allowance for credit loss | $ 717 | $ 671
Trade receivable | 14,600 |
Non-trade receivable | 3,300 |
Investments and Advances |  |
Related Party Transaction [Line Items] |  |
Allowance for credit loss | $ 560 | $ 560

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