Schedule II Valuation and Qualifying Accounts Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions |
12 Months Ended | ||||||||||||
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Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2015 |
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Allowance for Doubtful Accounts | |||||||||||||
Movement in Valuation Allowances and Reserves [Roll Forward] | |||||||||||||
Balance at Beginning of Period | $ 55 | $ 48 | $ 58 | ||||||||||
Additions Charged to Expense | 7 | 9 | 8 | ||||||||||
Additions Charged to Other Accounts | 39 | 13 | 18 | ||||||||||
Other Changes | [1] | (7) | (15) | (36) | |||||||||
Balance at End of Period | 94 | 55 | 48 | ||||||||||
Allowance for Deferred Tax Assets | |||||||||||||
Movement in Valuation Allowances and Reserves [Roll Forward] | |||||||||||||
Balance at Beginning of Period | 165 | [2],[3] | 112 | [3] | 106 | ||||||||
Additions Charged to Expense | 6 | [2] | 1 | [3] | 0 | ||||||||
Additions Charged to Other Accounts | 7 | [2] | 52 | [3] | 9 | ||||||||
Other Changes | [1] | (70) | [2] | 0 | [3] | (3) | |||||||
Balance at End of Period | $ 108 | [2] | $ 165 | [2],[3] | $ 112 | [3] | |||||||
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