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Derivative Instruments and Hedging Activities Derivatives, Additional Information (Details) € in Millions, shares in Millions, ¥ in Billions | 12 Months Ended
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Sep. 30, 2019 USD ($) shares | Sep. 30, 2019 EUR (€) | Sep. 30, 2019 JPY (¥) | Sep. 30, 2018 USD ($) shares | Sep. 30, 2018 EUR (€) | Sep. 30, 2018 JPY (¥) | Sep. 30, 2017 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | $ (3,000,000) |  |  | $ 27,000,000 |  |  | $ 42,000,000
Derivative Liability, Fair Value, Gross Liability | 2,568,000,000 |  |  | 3,175,000,000 |  |  |
Increase (Decrease) in Cash Collateral for Loaned Securities | $ 0 |  |  | $ 0 |  |  |
Hedge percentage for foreign exchange transactional exposures, Minimum | 70.00% | 70.00% | 70.00% |  |  |  |
Hedge percentage for foreign exchange transactional exposures, Maximum | 90.00% | 90.00% | 90.00% |  |  |  |
Derivative, amount of hedged ordinary shares | shares | 1.4 |  |  | 1.8 |  |  |
Gains (Losses) Reclassifed from CTA to Income for Outstanding Net Investment Hedges | $ 0 |  |  | $ 0 |  |  | 0
Document Period End Date | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2019 |  |  |  |
Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 2,568,000,000 |  |  | 3,173,000,000 |  |  |
Not Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 0 |  |  | 2,000,000 |  |  |
Foreign currency exchange derivatives | Other current liabilities | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 23,000,000 |  |  | 10,000,000 |  |  |
Foreign currency exchange derivatives | Other current liabilities | Not Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 0 |  |  | 2,000,000 |  |  |
Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount of Nonderivative Instruments | ¥ |  |  | ¥ 25 |  |  | ¥ 35 |
Equity swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Amount of Hedged Item | 60,000,000 |  |  | 73,000,000 |  |  |
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount of Nonderivative Instruments | € |  | € 888 |  |  | € 1,000,000,000,000 |  |
750 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount of Nonderivative Instruments | € |  | 750 |  |  | 750 |  |
423 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount of Nonderivative Instruments | € |  | 423 |  |  |  |  |
58 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount of Nonderivative Instruments | € |  | € 54 |  |  | 58 |  |
215 million EUR maturing in March 2020 [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount of Nonderivative Instruments | € |  |  |  |  | 215 |  |
500 million euro net investment hedge [Member] [Member] | Foreign Currency Denominated Debt [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount of Nonderivative Instruments | € |  |  |  |  | € 423 |  |
Net Investment Hedging [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | $ 145,000,000 |  |  | $ 45,000,000 |  |  | $ (138,000,000)

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