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Equity-based participation plans for associates (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Liabilities from share-based payment transactions $ 269 $ 326 $ 273
Continuing operations      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense from share-based payment transactions with employees $ 958 1,067 918
Discontinued operations      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expense from share-based payment transactions with employees   $ 9 $ 93