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Hedging transactions and derivative financial instruments Hedging transactions and derivative financial instruments (Summary of Notional Values and Pretax Impact in Fair Values) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative and nonderivative, original notional amount | $ 13,001 | $ 11,448
Derivative and nonderivative, notional amount | 11,276 | 10,573
Gain (loss) recognized in OCI on derivatives and nonderivatives | 5 | (954)
Net investment hedging | Foreign currency contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, original notional amount | 1,875 | 2,875
Derivative, notional amount outstanding | 1,000 | 2,000
Gain (loss) recognized in OCI on derivatives | 24 | (104)
Net investment hedging | Foreign currency denominated debt |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Nonderivative hedging instruments | 6,276 | 4,573
Gain (loss) recognized in OCI on nonderivatives | 130 | (418)
Cash flow hedging | Foreign currency contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, original notional amount | 4,000 | 4,000
Derivative, notional amount outstanding | 4,000 | 4,000
Gain (loss) recognized in OCI on derivatives | (112) | $ (432)
Cash flow hedging | Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, original notional amount | 850 |
Derivative, notional amount outstanding | 0 |
Gain (loss) recognized in OCI on derivatives | $ (37) |

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