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Equity Items - Summary of Reconciliation of Changes in Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Balance, end of period |  | $ 3,625 | $ 3,305
Cash dividends declared per common share |  | $ 0.275 | $ 0.250
Common Stock and Paid in Capital [Member] |  |  |
Balance, beginning of period |  | $ 757 | $ 947
Common shares issued under stock incentive and other plans | [1] | 1 | 1
Balance, end of period |  | 758 | 948
Retained earnings [Member] |  |  |
Balance, beginning of period |  | 3,224 | 2,750
Adoption of new accounting pronouncements | [2] |  | 33
Net income (loss) |  | 32 | (48)
Regular dividends |  | (17) | (16)
Balance, end of period |  | 3,239 | 2,719
Accumulated other comprehensive income (loss) [Member] |  |  |
Balance, beginning of period |  | (410) | (291)
Adoption of new accounting pronouncements | [2] |  | (34)
Unrealized translation gain (loss) |  | 38 | (31)
Pension and postretirement obligation adjustment |  |  | (6)
Balance, end of period |  | $ (372) | $ (362)
[1] | Common shares issued were 70,461 shares and 140,614 shares for the three months ended December 31, 2019 and 2018, respectively.
[2] | Represents the cumulative-effect adjustment related to the adoption of the new guidance related to the accounting for equity securities and tax effects of intercompany transfers during fiscal 2019.

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