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Basis of Presentation and Summary of Significant Accounting Policies - Net Periodic Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cost of sales | $ 4,031 | $ 4,314 | $ 8,009 | $ 8,317
Gross profit | 197 | 282 | 377 | 483
Earnings (loss) before interest and income taxes | (22) | (141) | 32 | (40)
Other pension expense (income) | $ 0 | (7) | $ (2) | (8)
Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Other pension expense (income) |  | 6 |  | 6
Restatement Adjustment | Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cost of sales |  | 2 |  | 3
Gross profit |  | (2) |  | (3)
Earnings (loss) before interest and income taxes |  | (7) |  | (8)
Other pension expense (income) |  | 7 |  | 8
EMEA | Restatement Adjustment | Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Adjusted EBITDA |  | $ 1 |  | $ 2

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