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Stock-based Compensation Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Stock Based Compensation Activity [Line Items] |  |  |
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options | $ 12 | $ 1 | $ 6
Compensation cost charged against income from share-based compensation plans | $ 97 | $ 66 | $ 103
Stock Appreciation Rights (SARs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Weighted Average Option Price, Outstanding beginning balance | $ 30.14 |  |
Weighted Average Option Price, Granted | 45.69 |  |
Weighted Average Option Price, Exercised | 28.16 |  |
Weighted Average Option Price, Forfeited or expired | 32.45 |  |
Weighted Average Option Price, Outstanding ending balance | 34.99 | $ 30.14 |
Weighted Average Option Price, Exercisable | $ 31.40 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Shares Subject to Option, Outstanding beginning balance | 212,637 |  |
Shares Subject to Option, Granted | 35,254 |  |
Shares Subject to Option, Exercised | (88,600) |  |
Shares Subject to Option, Forfeited or expired | (18,708) |  |
Shares Subject to Option, Outstanding ending balance | 140,583 | 212,637 |
Shares Subject to Option, Exercisable | 105,329 |  |
Weighted Average Remaining Contractual Life (years), Outstanding | 3 years 1 month 6 days |  |
Weighted Average Remaining Contractual Life (years), Exercisable | 1 year |  |
Aggregate Intrinsic Value, Outstanding | $ 5 |  |
Aggregate Intrinsic Value, Exercisable | $ 4 |  |
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Weighted Average Option Price, Outstanding beginning balance | $ 37.14 |  |
Weighted Average Option Price, Granted | 45.69 |  |
Weighted Average Option Price, Exercised | 36.70 |  |
Weighted Average Option Price, Forfeited or expired | 37.16 |  |
Weighted Average Option Price, Outstanding ending balance | 38.84 | $ 37.14 |
Weighted Average Option Price, Exercisable | $ 37.01 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Shares Subject to Option, Outstanding beginning balance | 10,114,905 |  |
Shares Subject to Option, Granted | 932,678 |  |
Shares Subject to Option, Exercised | (4,840,511) |  |
Shares Subject to Option, Forfeited or expired | (256,061) |  |
Shares Subject to Option, Outstanding ending balance | 5,951,011 | 10,114,905 |
Shares Subject to Option, Exercisable | 3,536,889 |  |
Weighted Average Remaining Contractual Life (years), Outstanding | 5 years 10 months 24 days |  |
Weighted Average Remaining Contractual Life (years), Exercisable | 4 years 3 months 18 days |  |
Aggregate Intrinsic Value, Outstanding | $ 174 |  |
Aggregate Intrinsic Value, Exercisable | $ 110 |  |

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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