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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense for stock option and incentive shares plans | $ 120 | $ 216 |  |
Income tax benefits recognized in income statement for compensation arrangements | 20 | $ 42 | $ 33 |
Unrecognized compensation cost related to non-vested awards granted | $ 138 |  |  |
Unrecognized compensation cost is expected to be recognized, weighted-average period, years | 1 year 7 months 6 days |  |  |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of options granted at the closing market price of common stock on the grant date | 100.00% |  |  |
Amount of stock option vesting per year | one-third |  |  |
Stock option expiration years from date of grant years | 10 years |  |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 11,600,000 |  |  |
Weighted-average price of shares granted |  | $ 12.13 | $ 8.36 |
Cash received for stock options exercises | $ 40 | $ 143 | $ 148 |
Options exercised, total intrinsic value | 16 | 53 | 36 |
Tax benefit from exercise of stock options | $ 8 | $ 7 | $ 2 |
Risk-free interest rate |  | 2.40% | 1.70% |
Expected dividend yield |  | 2.90% | 3.60% |
Expected volatility rate |  | 23.00% | 24.00% |
Expected life of option |  | 7 years | 7 years |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding | 1,262,700 |  |  |
Shares vested in period | 250,000 |  |  |
Common shares issued | 148,707 |  |  |
Shares withheld for income taxes | 101,293 |  |  |
Incentive Shares Member |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 8,800,000 |  |  |
Unvested shares outstanding | 6,325,000 | 6,898,000 |  |
Shares vested in period | 2,068,000 |  |  |
Total fair value of shares vested | $ 145 | $ 20 | $ 245 |
Cash paid primarily for tax withholdings | $ 73 | $ 9 | 101 |
Restricted Stock For Non Management Directors Member |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant | 139,635 |  |  |
Restricted stock awarded | 17,466 |  |  |
Restricted stock units awarded | 2,264 |  |  |
Includes both Continuing and Discontinued Operations [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense for stock option and incentive shares plans |  |  | 115 |
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation expense for stock option and incentive shares plans |  |  | $ 5 |
2013 Performance Share Plan [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding |  |  |  | 4,944,575
Percent level objectives were met |  |  |  | 86.00%
Shares vested in period |  |  |  | 4,252,335
2016 Performance Share Plan [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding |  | 1,874,750 |  |
Percent level objectives were met |  | 97.00% |  |
Shares vested in period |  | 1,818,510 |  |
Common shares issued | 1,023,789 |  |  |
Shares withheld for income taxes | 588,094 |  |  |
Performance shares distributed, paid in cash | 206,627 |  |  |
2017 Performance Share Plan [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding | 1,877,650 |  |  |
Percent level objectives were met | 107.00% |  |  |
Shares vested in period | 2,009,085 |  |  |
2018 Performance Share Plan [Member] | Performance Shares [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding | 2,125,954 |  |  |
2019 Performance Share Plan [Member] | Performance Shares [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding | 1,811,605 |  |  |
Share-based Compensation Award, Tranche One [Member] | 2013 Performance Share Plan [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares vested in period |  |  | 2,549,083 |
Common shares issued |  |  | 1,393,715 |
Shares withheld for income taxes |  |  | 944,002 |
Performance shares distributed, paid in cash |  |  | 211,366 |
Share-based Compensation Award, Tranche Two [Member] | 2013 Performance Share Plan [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares vested in period |  |  | 1,691,986 |
Common shares issued |  |  | 1,070,264 |
Shares withheld for income taxes |  |  | 616,734 |
Performance shares distributed, paid in cash |  |  | 4,988 |
Performance shares canceled |  |  | 11,266 |

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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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