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Summary of Significant Accounting Policies (Details) shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2016 USD ($) country shares | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |
Number of countries in which entity operates (more than) | country | 200 |
Excess tax benefits | $ 909 | $ 698
Increase to net cash provided by operating activities | 2,508 | 1,979
Increase in net cash used in financing activities | (1,730) | $ 13,534
New Accounting Pronouncement, Early Adoption, Effect |  |
Business Acquisition [Line Items] |  |
Excess tax benefits | $ (26) |
Increase to diluted weighted average common shares outstanding (shares) | shares | 1 |
Increase to net cash provided by operating activities | $ 26 |
Increase in net cash used in financing activities | $ (26) |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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