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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, 2021 | Sep. 30, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 6,318 | $ 5,750
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 | $ 993 | $ 1,302
Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 2,193 | 1,686
Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 135 | 133
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 2,997 | 2,629
U.S. equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,270 | $ 1,331
Percentage of defined benefit plan assets | 20.00% | 23.00%
U.S. equities [Member] | Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 591 | $ 785
U.S. equities [Member] | Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 9 | 10
U.S. equities [Member] | Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 0 | 0
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 | 670 | 536
International equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 936 | $ 1,164
Percentage of defined benefit plan assets | 15.00% | 20.00%
International equities [Member] | Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 356 | $ 513
International equities [Member] | Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 17 | 16
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 | 563 | 635
Emerging market equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 213 | $ 237
Percentage of defined benefit plan assets | 3.00% | 4.00%
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 | 1 | 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 | 212 | 237
Corporate bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 2,081 | $ 1,648
Percentage of defined benefit plan assets | 33.00% | 29.00%
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 | 1,516 | 1,202
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 | 565 | 446
Government bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 1,372 | $ 981
Percentage of defined benefit plan assets | 22.00% | 17.00%
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 | 642 | 450
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 | 730 | 531
Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 446 | $ 389
Percentage of defined benefit plan assets | 7.00% | 7.00%
Other [Member] | Fair Value, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | $ 46 | $ 4
Other [Member] | Fair Value, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 8 | 8
Other [Member] | Fair Value, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair values of defined benefit plan assets | 135 | 133
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 | $ 257 | $ 244

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