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Benefit Plans Obligations and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Pension Benefits |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation |  | $ 10,536 | $ 13,348 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  | 10,099 | 10,536 |
Service cost |  | 32 | 53 | $ 57
Plan participants' contributions |  | 4 | 5 |
Change in Plan Assets due to Collections |  | 0 | 0 |
Collections | [1] | 0 | 0 |
Actuarial loss (gain) |  | 284 | (2,509) |
Net transfers from variable fund/401(k) plan |  | 4 | 11 |
Expenses paid |  | (7) | (6) |
Benefits paid |  | 754 | 744 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  | 8,129 | 8,094 |
Change in plan assets |  |  |  |
Fair value of net plan assets |  | 8,094 | 9,110 |
Actual return on plan assets |  | 482 | (590) |
Employer contributions |  | 306 | 308 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |  |
Funded status |  | $ (1,970) | $ (2,442) |
Discount rate |  | 5.95% | 5.60% | 2.90%
Amount of defined benefit plan actuarial gain (loss) from discount rate change |  | $ (334) | $ (3,500) |
Amount of defined benefit plan actuarial gain (loss) from change in mortality assumption |  | (61) | (78) |
Amount of defined benefit plan actuarial gain (loss) from change in demograhic and plan experience |  | 12 | 527 |
Amount of defined benefit plan actuarial gain (loss) from assumption change in elections |  |  | 411 |
Other Post-retirement Benefits |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation |  | 347 | 388 |
Postconfirmation, Other Postretirement Obligations |  | 388 | 498 |
Service cost |  | 10 | 17 | $ 18
Plan participants' contributions |  | 0 | 0 |
Change in Plan Assets due to Collections |  | 13 | 15 |
Collections | [1] | 13 | 15 |
Actuarial loss (gain) |  | 44 | 114 |
Net transfers from variable fund/401(k) plan |  | 0 | 0 |
Expenses paid |  | 0 | 0 |
Benefits paid |  | 38 | 43 |
Actuarial Gain (Loss) from Changes in Discount Rate |  | 17 | 168 |
Actuarial Gain (Loss) Reflecting Plan Experience for Contribution Costs |  | 27 |  |
Actuarial Gain (Loss) from Delaying post-Medicare Trend Rate Assumption |  |  | 31 |
Actuarial Gain (Loss) from pre-Medicare Trend Rate Assumptions |  |  | 67 |
Actuarial Gain (Loss) from Changes in Mortality Assumptions |  |  | 18 |
Change in plan assets |  |  |  |
Fair value of net plan assets |  | 0 | 0 |
Actual return on plan assets |  | 0 | 0 |
Employer contributions |  | 25 | 28 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] |  |  |  |
Funded status |  | $ (347) | $ (388) |
Discount rate |  | 6.05% | 5.65% | 305.00%
[1] | Collections include retiree contributions as well as provider discounts and rebates.

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