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Pension and Other Benefit Plans - Changes in Accumulated Postretirement Benefit Obligation, Plan Assets and Funded Status (Detail) - Postretirement medical plan - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Change in Projected Benefit Obligations: |  |  |
Projected benefit obligation at beginning of year | $ 805 | $ 808 |
Service cost | 19 | 16 | $ 23
Interest cost | 41 | 42 | 33
Contribution by plan participants | 6 | 7 |
Actuarial losses (gains) | (37) | (7) |
Benefits paid | (53) | (61) |
Projected benefit obligation at end of year | 781 | 805 | 808
Change in Plan Assets: |  |  |
Plan assets at fair value at beginning of year | 964 | 938 |
Actual return on plan assets | 1 | 87 |
Contributions by plan participants | 6 | 7 |
Benefits paid | (58) | (68) |
Plan assets at fair value at end of year | 913 | 964 | $ 938
Asset / (Unfunded Liability) | 132 | 159 |
Amounts Recognized in Accumulated Other Comprehensive Loss: |  |  |
Actuarial losses | 224 | 239 |
Prior service credit | 13 | 36 |
Total amount recognized in accumulated other comprehensive income | $ 237 | $ 275 |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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