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Employee Benefits - Additional Information (Detail) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 06, 2024 retiree | Feb. 29, 2024 USD ($) agreement | Dec. 31, 2023 | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Number of pension authorization commitment agreements | agreement |  | 2 |  |  |  |  |  |
Liability, defined benefit plan |  | $ 5,900 |  |  |  |  |  |
Amount paid in severance benefits over the period |  |  |  | $ 60 |  |  | $ 178 |
Post employment benefits liability |  |  |  | 402 |  |  | $ 402 |
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 |  |  |  | (136) | $ 73 | $ 0 | $ (63) | $ 0
Defined benefit plan, benefit obligation, actuarial gain (loss) from pension annuitization |  |  |  |  | 200 |  |  |
Defined benefit plan, benefit obligation, actuarial gain (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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