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Stock-Based Compensation (Supplemental Incentive Share Information) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Incentive Shares Member |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares vested in period | 1,867,000 |  |
Unvested shares outstanding | 5,641,000 | 5,916,000 |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 5,100,000 |  |
Total fair value of shares earned/vested | $ 131 | $ 164 | $ 145
Share award distributed in cash, primarily for tax withholding | $ 58 | $ 81 | $ 73
Performance Shares [Member] | 2017 Performance Share Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period |  | 2017 - 2019 |
Percent payout |  | 107.00% |
Shares vested in period |  | 2,008,000 |
Performance shares distributed in cash, primarily for tax withholding |  | 883,000 |
Performance Shares [Member] | 2018 Performance Share Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period | 2018 - 2020 |  |
Percent payout | 100.00% |  |
Shares vested in period | 1,535,000 |  |
Performance shares distributed in cash, primarily for tax withholding | 672,000 |  |
Performance Shares [Member] | 2019 Performance Share Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percent payout | 101.00% |  |
Unvested shares outstanding | 1,327,000 |  |
Performance Shares [Member] | 2020 Performance Share Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding | 1,497,000 |  |
Performance Shares [Member] | 2021 Performance Share Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unvested shares outstanding | 1,547,000 |  |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares vested in period | 87,000 |  |
Unvested shares outstanding | 1,269,000 |  |
Common shares issued | 57,000 |  |
Shares withheld for income taxes | 30,000 |  |
Restricted Stock For Non Management Directors Member |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awarded | 19,000 |  |
Restricted stock units awarded | 2,000 |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 99,000 |  |

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- Definition Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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