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Details to the consolidated cash flow statements (Details 2) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement [line items] |  |  |
Income taxes paid (refund) | $ 1,921 | $ 1,993 | $ 1,809
Income taxes paid (refund), classified as investing activities |  |  | 139
Income taxes paid (refund), classified as operating activities | 1,833 | 1,876 | 1,506
Discontinued operations |  |  |
Statement [line items] |  |  |
Income taxes paid (refund), classified as investing activities | $ 88 | 79 |
Income taxes paid (refund), classified as operating activities |  | $ 38 | $ 164

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