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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Jun. 30, 2026
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The following table presents the computation of basic and diluted earnings per common share.
|  | Three months ended June 30, |  | Nine months ended June 30,
$ in millions, except per share amounts |  | 2026 |  | 2025 |  | 2026 |  | 2025
Income for basic earnings per common share: |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 595 |  |  | $ | 435 |  |  | $ | 1,699 |  |  | $ | 1,527 |
Less allocation of earnings and dividends to participating securities |  | (1) |  |  | — |  |  | (2) |  |  | (2) |
Net income available to common shareholders after participating securities |  | $ | 594 |  |  | $ | 435 |  |  | $ | 1,697 |  |  | $ | 1,525 |
Income for diluted earnings per common share: |  |  |  |  |  |  |  |
Net income available to common shareholders |  | $ | 595 |  |  | $ | 435 |  |  | $ | 1,699 |  |  | $ | 1,527 |
Less allocation of earnings and dividends to participating securities |  | (1) |  |  | — |  |  | (2) |  |  | (2) |
Net income available to common shareholders after participating securities |  | $ | 594 |  |  | $ | 435 |  |  | $ | 1,697 |  |  | $ | 1,525 |
Common shares: |  |  |  |  |  |  |  |
Average common shares in basic computation |  | 194.0 |  |  | 201.2 |  |  | 195.7 |  |  | 203.0 |
Dilutive effect of outstanding stock options and certain RSUs |  | 3.2 |  |  | 4.3 |  |  | 3.4 |  |  | 4.6 |
Average common and common equivalent shares used in diluted computation |  | 197.2 |  |  | 205.5 |  |  | 199.1 |  |  | 207.6 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 3.06 |  |  | $ | 2.16 |  |  | $ | 8.67 |  |  | $ | 7.51 |
Diluted |  | $ | 3.01 |  |  | $ | 2.12 |  |  | $ | 8.52 |  |  | $ | 7.35 |
Stock options and certain RSUs excluded from weighted-average diluted common shares because their effect would be antidilutive |  | 0.1 |  |  | 1.1 |  |  | — |  |  | 1.1 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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