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Equity Items - Summary of Reconciliation of Changes in Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Balance, end of period |  | $ 3,013 | $ 3,217 | $ 3,013 | $ 3,217
Cash dividends declared per common share |  | $ 0.275 | $ 0.275 | $ 0.825 | $ 0.775
Common Stock and Paid in Capital [Member] |  |  |  |  |
Balance, beginning of period |  | $ 766 | $ 953 | $ 757 | $ 947
Common shares issued under stock incentive and other plans | [1] | 3 | 2 | 12 | 8
Common shares purchased under repurchase program | [2] |  | (200) |  | (200)
Balance, end of period |  | 769 | 755 | 769 | 755
Retained earnings [Member] |  |  |  |  |
Balance, beginning of period |  | 2,641 | 2,780 | 3,224 | 2,750
Adoption of new accounting pronouncements | [3] |  |  |  | 34
Net income (loss) |  | 37 | 66 | (513) | 94
Regular dividends |  | (17) | (16) | (50) | (48)
Balance, end of period |  | 2,661 | 2,830 | 2,661 | 2,830
Accumulated other comprehensive income (loss) [Member] |  |  |  |  |
Balance, beginning of period |  | (424) | (371) | (410) | (291)
Adoption of new accounting pronouncements | [3] |  |  |  | (34)
Unrealized translation gain (loss) |  | 7 | 3 | (7) | (37)
Pension and postretirement obligation adjustment |  |  |  |  | (6)
Balance, end of period |  | $ (417) | $ (368) | $ (417) | $ (368)
[1] | Common shares issued were 14,460 shares and 46,725 shares for the three months ended June 30, 2020 and 2019, respectively, and 293,485 shares and 281,077 shares for the nine months ended June 30, 2020 and 2019.
[2] | Common shares repurchased were zero shares and 2,236,546 in the three and nine months ended June 30, 2020 and 2019.
[3] | 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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