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Employee Benefit Plans (Summary of Changes in Pension and Other Postretirement Benefit Plans) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |
Noncurrent pension and other postretirement benefit assets | $ 1,779 | $ 1,479 |  |
Noncurrent assets held for sale |  | 18,831 |  |
Noncurrent liabilities held for sale | 0 | (7,544) |  |
Pension Benefits |  |  |  |
Changes in benefit obligation: |  |  |  |
Benefit obligation at beginning of year | 8,066 | 10,890 | $ 8,066 |
Service cost | $ 96 | $ 142 | $ 170 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) |
Interest cost | $ 442 | $ 333 | $ 317 |
Benefits paid | (493) | (511) |  |
Actuarial (gain) loss during the year | 322 | (2,716) |  |
Plan amendments | 2 |  |  |
Sale of Hope |  | (64) |  |
Settlements and curtailments | (4) | (8) |  |
Benefit obligation at end of year | 8,431 | 8,066 | 10,890 | $ 8,066
Changes in fair value of plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 8,694 | 11,945 |  |
Actual return gain (loss) on plan assets | 882 | (2,556) |  |
Employer contributions | 8 | 9 |  |
Benefits paid | (493) | (511) |  |
Sale of Hope |  | (188) |  |
Settlements | (4) | (5) |  |
Fair value of plan assets at end of year | 9,087 | 8,694 | 11,945 |
Funded status at end of year | 656 | 628 |  |
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |
Noncurrent pension and other postretirement benefit assets | 647 | 580 |  |
Noncurrent assets held for sale | 308 | 295 |  |
Other current liabilities | (27) | (12) |  |
Noncurrent pension and other postretirement benefit liabilities | (237) | (196) |  |
Noncurrent liabilities held for sale | (35) | (39) |  |
Net amount recognized | $ 656 | $ 628 |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |
Weighted average rate of increase for compensation | 4.28% | 4.38% |  |
Pension Benefits | Minimum |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |
Discount rate | 5.37% | 5.65% |  |
Crediting interest rate for cash balance and similar plans | 4.12% | 4.40% |  |
Pension Benefits | Maximum |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |
Discount rate | 5.47% | 5.75% |  |
Crediting interest rate for cash balance and similar plans | 4.22% | 4.50% |  |
Other Postretirement Benefits |  |  |  |
Changes in benefit obligation: |  |  |  |
Benefit obligation at beginning of year | $ 1,127 | $ 1,537 |  |
Service cost | $ 14 | $ 22 | $ 25 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Interest cost | $ 61 | $ 45 | $ 46 |
Benefits paid | (94) | (97) |  |
Actuarial (gain) loss during the year | 1 | (361) |  |
Sale of Hope |  | (19) |  |
Benefit obligation at end of year | 1,109 | 1,127 | 1,537 |
Changes in fair value of plan assets: |  |  |  |
Fair value of plan assets at beginning of year | 1,845 | 2,323 |  |
Actual return gain (loss) on plan assets | 277 | (416) |  |
Benefits paid | (60) | (62) |  |
Fair value of plan assets at end of year | 2,062 | 1,845 | $ 2,323 |
Funded status at end of year | 953 | 718 |  |
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |
Noncurrent pension and other postretirement benefit assets | 1,132 | 899 |  |
Noncurrent assets held for sale | 13 | 11 |  |
Other current liabilities | (13) | (13) |  |
Noncurrent pension and other postretirement benefit liabilities | (179) | (179) |  |
Net amount recognized | $ 953 | $ 718 |  |
Other Postretirement Benefits | Minimum |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |
Discount rate | 5.40% | 5.69% |  |
Other Postretirement Benefits | Maximum |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |
Discount rate | 5.42% | 5.70% |  |

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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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