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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, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative and nonderivative, original notional amount | $ 13,358 | $ 12,298 | $ 13,358 | $ 12,298 |
Derivative and nonderivative, notional amount | 10,883 | 10,573 | 10,883 | 10,573 |
Gain (loss) recognized in OCI on derivatives and nonderivatives |  |  | 986 | (954) |
Reclassification from AOCI |  |  | (222) | 407 | $ 172
Net investment hedging | Foreign currency contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, original notional amount | 3,875 | 2,875 | 3,875 | 2,875 |
Derivative, notional amount outstanding | 3,000 | 2,000 | 3,000 | 2,000 |
Gain (loss) recognized in OCI on derivatives and nonderivatives |  |  | 130 | (104) |
Reclassification from AOCI |  |  | 0 | 0 |
Net investment hedging | Foreign currency denominated debt |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Nonderivative hedging instruments | 3,883 | 4,573 |  |  |
Gain (loss) recognized in OCI on nonderivatives |  |  | 333 | (418) |
Reclassification from AOCI |  |  | 0 | 0 |
Cash flow hedging | Foreign currency contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, original notional amount | 4,000 | 4,000 | 4,000 | 4,000 |
Derivative, notional amount outstanding | 4,000 | 4,000 | 4,000 | 4,000 |
Gain (loss) recognized in OCI on derivatives and nonderivatives |  |  | 542 | (432) |
Reclassification from AOCI |  |  | (283) | 359 |
Cash flow hedging | Interest rate swaps |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, original notional amount | 1,600 | 850 | 1,600 | 850 |
Derivative, notional amount outstanding | $ 0 | $ 0 | 0 | 0 |
Gain (loss) recognized in OCI on derivatives and nonderivatives |  |  | (19) | 0 |
Reclassification from AOCI |  |  | 3 | 2 |
Cash Flow and Net Investment Hedges |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Reclassification from AOCI |  |  | $ (280) | $ 361 |

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