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Financial Instruments (Net Investment Hedge) (Details) € in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Jan. 31, 2019 EUR (€)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) to other comprehensive income, pretax | $ 32 | $ (1) | $ 13 | $ 0 |
Foreign Exchange Contract [Member] | Net Investment Hedging [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (loss) to other comprehensive income, pretax | 6 |  |  |  |
Gain (loss) to other comprehensive income, after-tax | $ 5 |  |  |  |
1.25 Percent Notes Due October 2025 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount | € |  |  |  |  | € 500
Notes interest rate, percentage |  |  |  |  | 1.25%
2.0 Percent Notes Due October 2029 [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, face amount | € |  |  |  |  | € 500
Notes interest rate, percentage |  |  |  |  | 2.00%

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