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Employee Benefits - Narrative (Detail) $ in Millions |  |  | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 06, 2024 retiree | Feb. 29, 2024 USD ($) agreement | Mar. 31, 2025 employee | Dec. 31, 2024 USD ($) plan shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Accumulated benefit obligation for all defined benefit pension plans |  |  |  | $ 7,900 | $ 15,100 |  |
Defined benefit plan, number of pension authorization commitment agreements | agreement |  | 2 |  |  |  |  |
Liability, defined benefit plan |  | $ 5,800 |  |  |  |  |
Defined benefit plan, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate |  |  |  | $ 1,400 | $ (503) | $ 7,000 |
Discount Rate |  |  |  |  | 5.00% | 5.20% | 2.90%
Defined benefit plan, benefit obligation, actuarial gain (loss) from healthcare cost assumptions used calculating benefit obligation, discount rate |  |  |  |  | $ (534) |  |
Weighted-average healthcare cost trend rate assumed for next year |  |  |  | 8.80% | 7.30% | 6.60% |
Defined benefit plan, reclassification adjustment from AOCI |  |  |  | $ 0 | $ 252 | $ 390 |
Defined benefit plan, period used to determine overall expected long term rate of return on assets assumption (in years) |  |  |  | 10 years |  |  |
Number of leveraged employee stock ownership plans (ESOP) | plan |  |  |  | 4 |  |  |
Number of allocated shares of common stock in ESOP (in shares) | shares |  |  |  | 39,000,000 |  |  |
Number of unallocated shares of common stock in ESOP (in shares) | shares |  |  |  | 0 |  |  |
Total savings plan cost |  |  |  | $ 700 | 724 | 620 |
Severance liability charged to expense |  |  |  | 1,494 | 531 | 319 |
Defined benefit plan, actuarial gain (loss), immediate recognition as component in net periodic benefit (cost) credit |  |  |  | 657 | (992) | 1,700 |
Pension and benefit credits (charges) from actual return |  |  |  | (1,000) | (503) | 206 |
Defined benefit plan, benefit obligation, actuarial gain (loss) from actuarial assumption adjustments |  |  |  |  | 45 | (5,500) |
Scenario, Forecast |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Restructuring and related cost, number of positions eliminated | employee |  |  | 4,800 |  |  |  |
Minimum |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Selected bonds |  |  |  | $ 300 |  |  |
Minimum | Return Seeking Assets |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  | 53.00% |  |  |
Minimum | Liability Hedging Assets |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  | 41.00% |  |  |
Maximum | Return Seeking Assets |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  | 63.00% |  |  |
Maximum | Liability Hedging Assets |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  | 51.00% |  |  |
Maximum | Cash and cash equivalents |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Target allocation percentage of assets |  |  |  | 10.00% |  |  |
Pension |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined benefit plan, number of retirees receiving benefit payments from pension plan | retiree | 56,000 |  |  |  |  |  |
Annuity contracts transfer |  |  |  | $ 5,611 | 0 |  |
Defined benefit plan, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate |  |  |  | $ 764 | $ (288) | 4,100 |
Discount Rate |  |  |  | 5.80% | 5.00% |  |
Defined benefit plan, benefit obligation, actuarial gain (loss) from pension annuitization |  | $ 200 |  | $ 200 |  |  |
Defined benefit plan, benefit obligation, actuarial gain (loss) from healthcare cost assumptions used calculating benefit obligation, discount rate |  |  |  |  | $ (534) |  |
Company contributions |  |  |  | 421 | 252 |  |
Defined benefit plan, actuarial gain (loss), immediate recognition as component in net periodic benefit (cost) credit |  |  |  | 110 | (266) | (1,505) |
Pension | Qualified Plan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Company contributions |  |  |  | 365 |  |  |
Pension | Nonqualified Plan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Company contributions |  |  |  | 56 |  |  |
Health Care and Life |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Annuity contracts transfer |  |  |  | 0 | 0 |  |
Defined benefit plan, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate |  |  |  | $ 656 | $ (215) | 2,900 |
Discount Rate |  |  |  | 5.60% | 5.00% |  |
Company contributions |  |  |  | $ 935 | $ 936 |  |
Defined benefit plan contributions by employer in next fiscal year |  |  |  | 726 |  |  |
Defined benefit plan, actuarial gain (loss), immediate recognition as component in net periodic benefit (cost) credit |  |  |  | $ 547 | $ (726) | $ 3,182 |
Pension and Postretirement Plan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Discount Rate |  |  |  | 5.70% |  |  |

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