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v3.25.3

Employee Benefits - Additional Information (Detail) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 10 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 06, 2024 USD ($) retiree | Feb. 29, 2024 USD ($) agreement | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Mar. 31, 2025 employee
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Number of pension authorization commitment agreements | agreement |  | 2 |  |  |  |  |  |  |
Liability, defined benefit plan |  | $ 5,800 |  |  |  |  |  |  |
Restructuring and related cost, number of positions eliminated | employee |  |  |  |  |  |  |  |  | 4,800
Charges related to voluntary separations |  |  | $ 0 | $ 1,733 |  |  | $ 0 | $ 1,733 |
Severance costs, net of tax |  |  |  | 1,300 |  |  |  | 1,300 |
Post employment benefits liability |  |  | 331 |  |  |  | 331 |  |
Employee Severance |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Amount paid in severance benefits over the period |  |  | 56 |  |  |  | 663 |  |
Other Postemployment Benefits |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Amount paid in severance benefits over the period |  |  |  |  |  |  | 96 |  |
Pension |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Defined benefit plan, benefit obligation, actuarial gain (loss) from pension annuitization |  | $ 200 |  |  |  | $ 200 |  |  |
Number of retirees receiving benefit payments from pension plan | retiree | 56,000 |  |  |  |  |  |  |  |
Defined benefit plan, plan assets, increase (decrease) for assets transferred to (from) plan | $ 5,600 |  |  |  |  |  |  |  |
Employer discretionary contribution amount |  |  | 563 |  |  |  | 563 | 365 |
Remeasurement gain (loss), net |  |  | $ 31 | $ 46 | $ (136) | 73 | $ (14) | $ (17) |
Defined benefit plan, benefit obligation, actuarial loss from settlements |  |  |  |  |  | 127 |  |  |
Charge due to difference between estimated and actual return on assets |  |  |  |  | 245 | 613 |  |  |
Defined benefit plan, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate |  |  |  |  | $ 109 | $ 486 |  |  |

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