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Taxes (Details 2) - USD ($) $ in Millions	12 Months Ended
Taxes (Details 2) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement [line items]
Income tax expense	$ (1,807)	$ (1,793)	$ (1,295)
Continuing operations [member]
Statement [line items]
Current tax expense (income)	(2,100)	(2,147)	(1,603)
Deferred tax expense (income)	293	354	308
Income tax expense	(1,807)	(1,793)	(1,295)
Continuing operations [member] \| Switzerland
Statement [line items]
Current tax expense (income)	(932)	(1,186)	(615)
Deferred tax expense (income)	(137)	(93)	(120)
Continuing operations [member] \| Foreign
Statement [line items]
Current tax expense (income)	(1,168)	(961)	(988)
Deferred tax expense (income)	$ 430	447	428
Discontinued operations [member]
Statement [line items]
Income tax expense		$ (159)	$ 74

- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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