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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Ending Balance |  | $ 3,217 | $ 3,399 | $ 3,217 | $ 3,399
Cash dividends declared per common share |  | $ 0.275 | $ 0.25 | $ 0.775 | $ 0.70
Common Stock and Paid In Capital [Member] |  |  |  |  |
Beginning Balance |  | $ 953 | $ 936 | $ 947 | $ 932
Common shares issued under stock incentive and other plans | [1] | 2 | 7 | 8 | 11
Common shares purchased under repurchase program | [2] | (200) |  | (200) |
Ending Balance |  | 755 | 943 | 755 | 943
Retained earnings [Member] |  |  |  |  |
Beginning Balance |  | 2,780 | 2,736 | 2,750 | 2,696
Adoption of new accounting pronouncements | [3] |  |  | 34 |
Net income (loss) |  | 66 | 36 | 94 | 104
Regular dividends |  | (16) | (16) | (48) | (44)
Ending Balance |  | 2,830 | 2,756 | 2,830 | 2,756
Accumulated other comprehensive income (loss) [Member] |  |  |  |  |
Beginning Balance |  | (371) | (162) | (291) | (222)
Adoption of new accounting pronouncements | [3] |  |  | (34) |
Unrealized translation gain (loss) |  | 3 | (140) | (37) | (82)
Pension and postretirement obligation adjustment |  |  |  | (6) |
Net change in investment securities |  |  | 2 |  | 4
Ending Balance |  | $ (368) | $ (300) | $ (368) | $ (300)
[1] | Common shares issued were 46,725 and 42,958 for the three months ended June 30, 2019 and 2018 and 281,077 and 308,779 for the nine months ended June 30, 2019 and 2018.
[2] | Common shares repurchased were 2,236,546 in the three and nine months ended June 30, 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. See Note A for more information.

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