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Stockholders' Equity Effect of VE Territory Covered Losses Recovery on the Company Repurchasing its Common Stock (Details) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Sep. 30, 2017 USD ($) $ / shares shares
Series B Preferred Stock |  |
Conversion of Stock [Line Items] |  |
Stock As Converted Repurchased During Period Through VE Territory Covered Losses Recovery Shares (Less than 1 million Series C) | shares | 2 |
Share Reduction Price Paid Per Share VE Territory Covered Losses Recovery | $ / shares | $ 88.70 | [1]
Recovery through conversion rate adjustment | $ | $ 190 |
Series C Preferred Stock |  |
Conversion of Stock [Line Items] |  |
Stock As Converted Repurchased During Period Through VE Territory Covered Losses Recovery Shares (Less than 1 million Series C) | shares | 0 | [2]
Share Reduction Price Paid Per Share VE Territory Covered Losses Recovery | $ / shares | $ 85.01 | [1]
Recovery through conversion rate adjustment | $ | $ 1 |
[1] | Effective price per share is calculated using the volume-weighted average price of the Company's class A common stock over a pricing period in accordance with the Company's current certificates of designations for its series B and C convertible participating preferred stock.
[2] | The reduction in equivalent number of shares of class A common stock was less than one million shares.

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