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Financial Instruments (Net Investment Hedge) (Details) € in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2019 USD ($) | Sep. 30, 2019 EUR (€) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) to other comprehensive income, pretax | $ | $ (4) |  | $ 2 | $ 55
Foreign currency [Member] | Net Investment Hedging [Member] | Other Comprehensive Income (Loss) [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) to other comprehensive income, pretax | $ | 70 |  |  |
Gain (loss) to other comprehensive income, after-tax | $ | $ 54 |  |  |
1.25 Percent Notes Due October 2025 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from issuance of debt | € |  | € 500 |  |
Notes interest rate, percentage | 1.25% | 1.25% |  |
2.0 Percent Notes Due October 2029 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from issuance of debt | € |  | € 500 |  |
Notes interest rate, percentage | 2.00% | 2.00% |  |
0.375 Percent Notes Due May 2024 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from issuance of debt | € |  | € 500 |  |
Notes interest rate, percentage | 0.375% | 0.375% |  |

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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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