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Note 6, Derivative Instruments and Hedging Activities Derivative Assets and Liabilities (Details)
$ in Millions, € in Billions
Jun. 30, 2017
EUR (€)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset   $ 4 $ 9
Derivative Liability   1,145 1,150
Designated as Hedging Instrument [Member] | Long-term Debt [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value € 1.0 1,140 1,119
Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset   6 40
Derivative Liability   0 8
Not Designated as Hedging Instrument [Member] | Long-term Debt [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value   0 0
Foreign Exchange Contract [Member] | Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Current   9 49
Foreign Exchange Contract [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Current   5 39
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Current   4 9
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Current   5 31
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Current   5 40
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Current   0 8
Equity Swap [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Hedging Assets, Noncurrent   1  
Equity Swap [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Hedging Assets, Noncurrent   0 0
Equity Swap [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Hedging Assets, Noncurrent   $ 1 $ 0