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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, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |
Total cost |  | $ 6,891 | $ 6,987 | $ 2,910
Class A common stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares repurchased in the open market (in shares) | [1],[2] | 77 | 91 |
Average repurchase price per share | [2],[3] | $ 89.98 | $ 77.05 |
Total cost | [2] | $ 6,891 | $ 6,987 |
[1] | All shares repurchased in the open market have been retired and constitute authorized but unissued shares.
[2] | Shares repurchased in the open market reflect repurchases settled during fiscal 2017. These amounts include repurchases traded but not yet settled on or before September 30, 2016 for fiscal 2017 or September 30, 2015 for fiscal 2016 and exclude repurchases traded but not yet settled on or before September 30, 2017 for fiscal 2017 or September 30, 2016 for fiscal 2016.
[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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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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