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Employee Benefits - Additional Information (Detail) $ in Millions |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 06, 2024 retiree | Feb. 29, 2024 USD ($) agreement | Dec. 31, 2023 | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of pension authorization commitment agreements | agreement |  | 2 |  |  |
Liability, defined benefit plan |  | $ 5,900 |  |  |
Amount paid in severance benefits over the period |  |  |  | $ 118 |
Post employment benefits liability |  |  |  | $ 456 |
Pension |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected return on plan assets |  |  | 7.50% | 8.00% |
Number of retirees receiving benefit payments from pension plan | retiree | 56,000 |  |  |  |
Defined benefit plan, plan assets, increase (decrease) for assets transferred to (from) plan |  |  |  | $ 5,700 |
Employer discretionary contribution amount |  |  |  | 365 | $ 0
Remeasurement gain (loss), net |  |  |  | 73 | $ 0
Defined benefit plan, benefit obligation, actuarial gain (loss) from pension annuitization |  |  |  | 200 |
Defined benefit plan, benefit obligation, actuarial gain (loss) from settlements |  |  |  | (127) |
Charge due to difference between estimated and actual return on assets |  |  |  | 613 |
Defined benefit plan, benefit obligation, actuarial gain (loss) from assumptions used calculating benefit obligation, discount rate |  |  |  | $ 486 |

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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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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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