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Income taxes (Income Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Examination [Line Items]
Income before income taxes	$ 8,133	$ 9,138	$ 9,545
Domestic [Member]
Income Tax Examination [Line Items]
Income before income taxes	4,087	4,371	4,856
Foreign [Member]
Income Tax Examination [Line Items]
Income before income taxes	$ 4,046	$ 4,767	$ 4,689

X

- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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