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Hedging transactions and derivative financial instruments Hedging transactions and derivative financial instruments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Reclassification from AOCI | $ (407) | $ (172) | $ (30)
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |
Derivative [Line Items] |  |  |
Reclassification from AOCI | (361) | (27) | $ 0
Foreign currency contracts | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |
Derivative [Line Items] |  |  |
Reclassification from AOCI | (359) | (27) |
Interest rate swaps | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |
Derivative [Line Items] |  |  |
Reclassification from AOCI | (2) | (1) |
Net investment hedging | Foreign currency contracts |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount outstanding | 2,000 | $ 1,000 |
Derivative, notional amount, entered into during period | $ 1,000 |  |

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