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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amounts Reclassified from OCI | $ 112 | $ (193) | $ (222)
Net investment hedging | Foreign currency contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, original notional amount | 3,875 | 3,875 |
Derivative, notional amount outstanding | 3,000 | 3,000 |
Gain (loss) recognized in OCI on derivatives and nonderivatives | (148) | 225 |
Amounts Reclassified from OCI | 0 | 0 |
Net investment hedging | Foreign currency denominated debt |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Nonderivative hedging instruments | 4,263 | 5,777 |
Net investment hedges, gain (loss), recognized in OCI | (102) | 248 |
Amounts Reclassified from OCI | 0 | 0 |
Cash flow hedging | Foreign currency contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, original notional amount | 4,000 | 4,000 |
Derivative, notional amount outstanding | 3,300 | 3,300 |
Gain (loss) recognized in OCI on derivatives and nonderivatives | (214) | 378 |
Amounts Reclassified from OCI | 107 | (238) |
Cash flow hedging | Interest rate swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, original notional amount | 1,600 | 1,600 |
Derivative, notional amount outstanding | 0 | 0 |
Gain (loss) recognized in OCI on derivatives and nonderivatives | 0 | 0 |
Amounts Reclassified from OCI | 3 | 3 |
Cash flow and net investment hedges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Original Notional Amount | 13,738 | 15,252 |
Notional Amount Outstanding | 10,563 | 12,077 |
Gain (loss) recognized in OCI on derivatives and nonderivatives | (464) | 851 |
Amounts Reclassified from OCI | $ 110 | $ (235) |

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