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Equity Items - Summary of Reconciliation of Changes in Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Balance, beginning of period |  | $ 3,406 | $ 3,406 |
Balance, end of period |  | $ 3,571 | $ 3,406 | $ 3,406
Cash dividends declared per common share |  | $ 1.05 | $ 0.95 | $ 1.23
Common Stock and Paid in Capital [Member] |  |  |  |
Balance, beginning of period |  | $ 947 | $ 932 | $ 924
Common shares issued under stock incentive and other plans | [1] | 10 | 15 | 8
Common shares purchased under repurchase program | [2] | (200) |  |
Balance, end of period |  | 757 | 947 | 932
Retained earnings [Member] |  |  |  |
Balance, beginning of period |  | 2,750 | 2,696 | 2,704
Adoption of new accounting pronouncements | [3] | 34 |  |
Net income (loss) |  | 505 | 114 | 1
Regular dividends |  | (65) | (60) | (77)
Distribution of Valvoline Inc | [4] |  |  | 68
Balance, end of period |  | 3,224 | 2,750 | 2,696
Accumulated other comprehensive income (loss) [Member] |  |  |  |
Balance, beginning of period |  | (291) | (222) | (281)
Adoption of new accounting pronouncements | [3] | (34) |  |
Unrealized translation gain (loss) |  | (80) | (82) | 81
Distribution of Valvoline Inc | [4] |  |  | (33)
Net change in investment securities |  |  | 13 | 15
Pension and postretirement obligation adjustment |  | (5) |  | (4)
Balance, end of period |  | $ (410) | $ (291) | (222)
Noncontrolling Interest [Member] |  |  |  |
Balance, beginning of period |  |  |  | (182)
Net income (loss) |  |  |  | 27
Distribution of Valvoline Inc | [4] |  |  | 152
Other |  |  |  | 7
Distributions to noncontrolling interest |  |  |  | $ (4)
[1] | Common shares issued were 336,188, 360,468 and 42,861 for 2019, 2018 and 2017, respectively
[2] | Common shares repurchased were 2,637,054 for 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.
[4] | See Note B for discussion of the noncontrolling interest and the initial public offering and distribution of Valvoline Inc

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