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Note 8. Fair Value Measurements Recurring Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Recurring $ 7 $ 8
Liabilities, Fair Value Disclosure, Recurring 22 11
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Recurring 0 0
Liabilities, Fair Value Disclosure, Recurring 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Recurring 7 8
Liabilities, Fair Value Disclosure, Recurring 22 11
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Recurring 0 0
Liabilities, Fair Value Disclosure, Recurring 0 0
Other Noncurrent Assets [Member] | Equity Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Hedging Assets, Noncurrent   3
Other Noncurrent Assets [Member] | Equity Swap [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Hedging Assets, Noncurrent   0
Other Noncurrent Assets [Member] | Equity Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Hedging Assets, Noncurrent   3
Other Noncurrent Assets [Member] | Equity Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Hedging Assets, Noncurrent   0
Other Current Liabilities [Member] | Foreign Exchange Contract [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Current 20 8
Other Current Liabilities [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Current 0 0
Other Current Liabilities [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Current 20 8
Other Current Liabilities [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Current 0 0
Other Current Assets [Member] | Foreign Exchange Contract [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 7  
Derivative Liability, Current   1
Other Current Assets [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 0 0
Derivative Liability, Current   0
Other Current Assets [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 7 4
Derivative Liability, Current   1
Other Current Assets [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Current 0 0
Derivative Liability, Current   0
Other Noncurrent Liabilities [Member] | Foreign Exchange Contract [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Current 2 3
Other Noncurrent Liabilities [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Current 0 0
Other Noncurrent Liabilities [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Current 2 3
Other Noncurrent Liabilities [Member] | Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability, Current $ 0 $ 0