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Note 7. Derivative Instruments and Hedging Activities Derivative Assets and Liabilities (Details)
$ in Millions, € in Billions
Dec. 31, 2017
USD ($)
Rate
Dec. 31, 2017
EUR (€)
Rate
Sep. 30, 2017
USD ($)
Foreign Exchange Contract [Member] | Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Current $ 7    
Derivative Liability, Current     $ 1
Foreign Exchange Contract [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Current 20   8
Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Current 2   3
Equity Swap [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Hedging Assets, Noncurrent     3
Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset 7   5
Derivative Liability 1,214   1,189
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 $ 1,197 € 1.0 1,180
Debt Instrument, Interest Rate, Stated Percentage | Rate 3.50% 3.50%  
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Current $ 7   4
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Current 0   1
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Current 15   6
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Current 2   3
Designated as Hedging Instrument [Member] | Equity Swap [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Hedging Assets, Noncurrent 0   0
Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset 0   3
Derivative Liability 5   2
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
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Current 0   0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Current 0   0
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Liability, Current 5   2
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Other Noncurrent Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Current 0   0
Not Designated as Hedging Instrument [Member] | Equity Swap [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Hedging Assets, Noncurrent $ 0   $ 3