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Discontinued operations (Details 4) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement [line items] |  |  |
Net cash flows used in investing activities from discontinued operations | $ (127) | $ (1,159) | $ (1,001)
Net cash flows used in/from financing activities from discontinued operations | (50) | 3,257 | (167)
Transaction cost payments | (147) | 56 | 67
Discontinued operations |  |  |
Statement [line items] |  |  |
Payments attributable to the spin-off of the Alcon business | (39) | (29) |
Divested cash and cash equivalents |  | (628) |
Cash flows attributable to divested business | (39) | (657) |
Other cash flows used in investing activities, net | $ (88) | (502) | (1,001)
Cash inflow from borrowings |  | 3,492 | 0
Transaction cost payments |  | $ 212 | $ 57

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