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Derivative Instruments and Hedging Activities Disclosure - Gains (Losses) on Net Investment Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | $ (21) | $ 78 | $ (101) | $ 119
Foreign Currency-Denominated Debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | (22) | 45 | (164) | 94
Cross-Currency Swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | (21) | $ 16 | (101) | $ 46
Terminated Currency Swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | $ 13 |  | $ 13 |

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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 + Details
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