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Employee Benefits - Narrative (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) plan shares | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation for all defined benefit pension plans | $ 15,100 | $ 15,300 |  |
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 | 7.30% | 6.60% | 6.20% |
Defined benefit plan, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate | $ (503) | $ 7,000 | $ 1,100 |
Discount Rate | 5.00% | 5.20% | 2.90% | 2.60%
Defined benefit plan, reclassification adjustment from AOCI | $ 252 | $ 390 | $ 708 |
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 | 42,000,000 |  |  |
Number of unallocated shares of common stock in ESOP (in shares) | shares | 0 |  |  |
Total savings plan cost | $ 724 | 620 | 690 |
Defined benefit plan, actuarial gain (loss), immediate recognition as component in net periodic benefit (cost) credit | (992) | 1,700 | 2,400 |
Pension and benefit credits (charges) from actual return |  | (5,500) | 847 |
Defined benefit plan, benefit obligation, actuarial gain (loss) from actuarial assumption adjustments | 45 | 206 | 453 |
Severance liability charged to expense | 531 | 319 | 233 |
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 | 34.00% |  |  |
Minimum | Liability Hedging Assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation percentage of assets | 62.00% |  |  |
Maximum | Return Seeking Assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation percentage of assets | 44.00% |  |  |
Maximum | Liability Hedging Assets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Target allocation percentage of assets | 72.00% |  |  |
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, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate | $ (288) | $ 4,100 |  |
Discount Rate | 5.00% | 5.20% |  |
Company contributions | $ 252 | $ 53 |  |
Defined benefit plan, actuarial gain (loss), immediate recognition as component in net periodic benefit (cost) credit | (266) | (1,505) | 1,419 |
Pension | Qualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company contributions | 200 |  |  |
Pension | Nonqualified Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company contributions | 52 |  |  |
Health Care and Life |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate | $ (215) | $ 2,900 |  |
Discount Rate | 5.00% | 5.20% |  |
Company contributions | $ 936 | $ 692 |  |
Defined benefit plan contributions by employer in next fiscal year | 770 |  |  |
Defined benefit plan, actuarial gain (loss), immediate recognition as component in net periodic benefit (cost) credit | $ (726) | $ 3,182 | $ 960 |
Pension and Postretirement Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount Rate | 5.00% |  |  |

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- Definition Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-3A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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