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Retirement Plans (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2021 USD ($) Person | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Retirement Plans [Line Items] |  |  |
Matching contributions charged to expense for defined contribution savings plans | $ 118 | $ 104 | $ 198
Number of multiemployer benefit plans in which the Company participates | Person | 275 |  |
Multiemployer Plan, Employer Contribution, Cost | $ 67 | 66 | 69
Pension Plan |  |  |
Retirement Plans [Line Items] |  |  |
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets, aggregate accumulated benefit obligation | 4,402 | 5,539 |
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets, aggregate fair value of plan assets | 3,841 | 4,528 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | 4,519 | 5,643 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 3,954 | 4,570 |
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation | 123 | 146 | $ 174
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets, aggregate fair value of plan assets | 38 | 34 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | $ 96 | $ 105 |

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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