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Income taxes (Income Before Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Examination [Line Items] |  |  |
Income before income taxes | $ 9,138 | $ 9,545 | $ 9,597
Domestic [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Income before income taxes | 4,371 | 4,856 | 4,436
Foreign [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Income before income taxes | $ 4,767 | $ 4,689 | $ 5,161

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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