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Note 15. Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Related Party Transaction [Line Items]        
Revenue from Related Parties $ 99   $ 98  
Related Party Transaction, Purchases from Related Party 137   $ 100  
Accounts Receivable, Related Parties 158     $ 129
Accounts Payable, Related Parties $ 122     $ 104
Related Party Transaction, Amounts of Transaction   $ 87