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Derivative Instruments and Hedging Activities Derivatives, Additional Information (Details)
€ in Millions, shares in Millions, ¥ in Billions
12 Months Ended
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)