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Note 13. NonConsolidated Partially-Owned Affiliates (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 1,924		$ 1,793
Equity Method Investment, Summarized Financial Information, Revenue	4,663	$ 4,324
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss)	566	539
Equity Method Investments Summarized Financial Information Operating Income (Loss)	279	295
Equity Method Investments Summarized Financial Information Net Income (Loss) Including Noncontrolling Interests	221	280
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	$ 216	259
Restatement Adjustment [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments Summarized Financial Information Operating Income (Loss)		14
Equity Method Investments Summarized Financial Information Net Income (Loss) Including Noncontrolling Interests		14
Equity Method Investment, Summarized Financial Information, Net Income (Loss)		$ 14

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