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Equity Items - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Payments for repurchase of common stock |  |  |  |  |  |  |  |  | $ 200,000,000
Common Stock, Dividends, Per Share, Paid |  | $ 0.275 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.225 | $ 0.225 |
Percentage of increase in cash dividend |  | 10.00% |  |  |  | 11.00% |  |  |
2018 Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 1,000,000,000 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 800,000,000 |  |  |  |  |  |  | $ 800,000,000
2019 Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Payments for repurchase of common stock | $ 200,000,000 |  |  |  |  |  |  |  |
Common stock repurchased | 2.2 |  |  |  |  |  |  |  |

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