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Employee Benefit Plans (Summary of Changes in Pension and Other Postretirement Benefit Plans) (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | 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 |  | $ 1,785 | $ 2,310 |
Pension Benefits |  |  |  |
Changes in benefit obligation: |  |  |  |
Benefit obligation at beginning of year |  | 10,890 | 11,363 |
Service cost |  | $ 142 | $ 170 | $ 173
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 |  | $ 333 | $ 317 | $ 351
Benefits paid |  | (511) | (488) |
Actuarial (gains) losses during the year |  | (2,716) | (413) |
Sale of Hope |  | (64) |  |
Settlements and curtailments |  | (8) | (59) |
Benefit obligation at end of year | $ 11,363 | 8,066 | 10,890 | 11,363
Changes in fair value of plan assets: |  |  |  |
Fair value of plan assets at beginning of year |  | 11,945 | 10,979 |
Actual return (loss) on plan assets |  | (2,556) | 1,202 |
Employer contributions | 250 | 9 | 284 |
Benefits paid |  | (511) | (488) |
Sale of Hope |  | (188) |  |
Settlements |  | (5) | (32) |
Fair value of plan assets at end of year | 10,979 | 8,694 | 11,945 | 10,979
Funded status at end of year |  | 628 | 1,055 |
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |
Noncurrent pension and other postretirement benefit assets |  | 875 | 1,246 |
Other current liabilities |  | (12) | (12) |
Noncurrent pension and other postretirement benefit liabilities |  | (235) | (179) |
Net amount recognized |  | $ 628 | $ 1,055 |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |
Weighted average rate of increase for compensation |  | 4.38% | 4.51% |
Pension Benefits | Minimum |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |
Discount rate |  | 5.65% | 3.06% |
Crediting interest rate for cash balance and similar plans |  | 4.40% | 1.81% |
Pension Benefits | Maximum |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |
Discount rate |  | 5.75% | 3.19% |
Crediting interest rate for cash balance and similar plans |  | 4.50% | 1.94% |
Other Postretirement Benefits |  |  |  |
Changes in benefit obligation: |  |  |  |
Benefit obligation at beginning of year |  | $ 1,537 | $ 1,746 |
Service cost |  | $ 22 | $ 25 | $ 28
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 |  | $ 45 | $ 46 | $ 58
Benefits paid |  | (97) | (105) |
Actuarial (gains) losses during the year |  | (361) | (161) |
Plan amendments |  |  | (14) |
Sale of Hope |  | (19) |  |
Benefit obligation at end of year | 1,746 | 1,127 | 1,537 | 1,746
Changes in fair value of plan assets: |  |  |  |
Fair value of plan assets at beginning of year |  | 2,323 | 2,100 |
Actual return (loss) on plan assets |  | (416) | 294 |
Benefits paid |  | (62) | (71) |
Fair value of plan assets at end of year | $ 2,100 | 1,845 | 2,323 | $ 2,100
Funded status at end of year |  | 718 | 786 |
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |
Noncurrent pension and other postretirement benefit assets |  | 910 | 1,064 |
Other current liabilities |  | (13) | (15) |
Noncurrent pension and other postretirement benefit liabilities |  | (179) | (263) |
Net amount recognized |  | $ 718 | $ 786 |
Other Postretirement Benefits | Minimum |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |
Discount rate |  | 5.69% | 3.04% |
Other Postretirement Benefits | Maximum |  |  |  |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |
Discount rate |  | 5.70% | 3.11% |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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