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Retirement Plans (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2019 USD ($) Person | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Retirement Plans [Line Items] |  |  |
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets, aggregate projected benefit obligation | $ 5,450 | $ 5,166 |
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets, aggregate accumulated benefit obligation | 5,388 | 5,072 |
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets, aggregate fair value of plan assets | 4,484 | 4,525 |
Total employer and employee contributions to defined benefit plans | 50 |  |
Voluntary contributions made by the company to defined benefit plans | 0 |  |
Estimated future employer contributions to defined benefit plans in next fiscal year | $ 50 |  |
Modification in salaried plans to limit company's cost of future annual retiree medical benefits | 150.00% |  |
Projected prescription drug subsidy receipts per year over the next ten years | $ 1 |  |
Matching contributions charged to expense for defined contribution savings plans | $ 198 | 205 | $ 190
Number of multiemployer benefit plans in which the Company participates | Person | 285 |  |
Employer contributions to multiemployer pension plans | $ 69 | 68 | 67
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation | 174 | $ 196 | $ 214
Total employer and employee contributions to defined benefit plans | 3 |  |
Estimated future employer contributions to defined benefit plans in next fiscal year | $ 4 |  |

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- Definition Percentage of 1993 cost to which the Company's cost of future annual retiree medical benefits is limited based on modifications to certain salaried plans. + References No definition available. + Details
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