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Retirement Plans (Schedule Of Fair Values Of Defined Benefit Plan Assets Organized By Asset Class And Fair Value Hierarchy Of ASC 820) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 5,492 | $ 5,476
Percentage of defined benefit plan assets | 100.00% | 100.00%
Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,249 | $ 1,670
Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 1,548 | 1,078
Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 515 | 471
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 2,180 | 2,257
U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,464 | $ 1,643
Percentage of defined benefit plan assets | 27.00% | 30.00%
U.S. equities [Member] | Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 789 | $ 968
U.S. equities [Member] | Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 5 | 5
U.S. equities [Member] | Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 386 | 350
U.S. equities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 284 | 320
International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,089 | $ 1,361
Percentage of defined benefit plan assets | 20.00% | 25.00%
International equities [Member] | Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 459 | $ 595
International equities [Member] | Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 15 | 21
International equities [Member] | Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
International equities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 615 | 745
Emerging market equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 213 | $ 243
Percentage of defined benefit plan assets | 4.00% | 5.00%
Emerging market equities [Member] | Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 0 | $ 0
Emerging market equities [Member] | Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
Emerging market equities [Member] | Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
Emerging market equities [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 213 | 243
Corporate bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,472 | $ 1,119
Percentage of defined benefit plan assets | 27.00% | 20.00%
Corporate bonds [Member] | Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 0 | $ 0
Corporate bonds [Member] | Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 1,008 | 696
Corporate bonds [Member] | Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
Corporate bonds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 464 | 423
Government bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,052 | $ 788
Percentage of defined benefit plan assets | 19.00% | 14.00%
Government bonds [Member] | Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 0 | $ 0
Government bonds [Member] | Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 512 | 350
Government bonds [Member] | Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
Government bonds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 540 | 438
High yield bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 0 | $ 10
Percentage of defined benefit plan assets | 0.00% | 0.00%
High yield bonds [Member] | Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 0 | $ 0
High yield bonds [Member] | Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
High yield bonds [Member] | Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
High yield bonds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 10
Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 202 | $ 312
Percentage of defined benefit plan assets | 3.00% | 6.00%
Other [Member] | Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1 | $ 107
Other [Member] | Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 8 | 6
Other [Member] | Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 129 | 121
Other [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 64 | $ 78

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