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Employee Benefits - Additional Information (Detail) $ in Millions				3 Months Ended				9 Months Ended		10 Months Ended
	Mar. 06, 2024 retiree	Feb. 29, 2024 USD ($) agreement	Dec. 31, 2023	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2025 employee
Defined Benefit Plan Disclosure [Line Items]
Charges related to voluntary separations				$ 1,733			$ 0	$ 1,733	$ 237
Severance costs, net of taxes				1,300				1,300
Number of pension authorization commitment agreements | agreement		2
Liability, defined benefit plan		$ 5,900
Amount paid in severance benefits over the period				188				366
Post employment benefits liability				1,700				$ 1,700
Scenario, Forecast
Defined Benefit Plan Disclosure [Line Items]
Restructuring and related cost, number of positions eliminated | employee										4,800
Pension
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets			7.50%					8.00%
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								$ 5,700
Employer discretionary contribution amount								365	200
Remeasurement gain (loss), net				$ 46	$ (136)	$ 73	$ 0	$ (17)	$ 0
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
Defined benefit plan, benefit obligation, actuarial gain (loss) from pension annuitization						200
Defined benefit plan, benefit obligation, actuarial loss from settlements						$ 127

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Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation.

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