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Stockholders' Equity Share Repurchases in the Open Market (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Class of Stock [Line Items] |  |  |  |  |  |
Shares repurchased in the open market |  | 1 |  |  |  |
Total cost |  | $ 120 | $ 6,987 |  | $ 2,910 | $ 4,118
Class A common stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares repurchased in the open market | [2] |  | 91 | [1] | 44 |
Average repurchase price per share | [3] |  | $ 77.05 | [1] | $ 65.98 |
Total cost |  |  | $ 6,987 | [1] | $ 2,910 |
[1] | (in millions, except per share data)2016 (1) 2015Shares repurchased in the open market(2)91 44Average repurchase price per share(3)$77.05 $65.98Total cost$6,987 $2,910
[2] | All shares repurchased in the open market have been retired and constitute authorized but unissued shares.
[3] | Figures in the table may not recalculate exactly due to rounding. Average repurchase price per share is calculated based on unrounded numbers.

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