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Retirement Plans and Other Retiree Benefits - Summary of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Components of Net Periodic Benefit Cost |  |  |  |  |
ERISA litigation matter | $ 267 |  | $ 0 | $ 267 | $ 0
Other Retiree Benefit Plans |  |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |  |
Service cost |  |  | 7 | 7 | 18
Interest cost |  |  | 36 | 38 | 36
Expected return on plan assets |  |  | 0 | 0 | 0
Amortization of transition and prior service costs (credits) |  |  | (21) | (20) | (6)
Amortization of actuarial loss |  |  | 4 | 1 | 14
Net periodic benefit cost |  |  | 26 | 26 | 62
Other postretirement charges |  |  | 0 | 0 | 2
ERISA litigation matter |  |  | 0 | 0 | 0
Total pension cost |  |  | $ 26 | $ 26 | $ 64
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost |  |  |  |  |
Discount rate |  |  | 5.37% | 5.67% | 3.06%
Long-term rate of compensation increase |  |  | 0.00% | 0.00% | 0.00%
ESOP growth rate |  |  | 6.00% | 6.00% | 6.00%
Medical cost trend rate of increase |  |  | 6.00% | 6.25% | 6.00%
Interest Crediting Rate |  |  | 0.00% | 0.00% | 0.00%
United States | Pension Plans |  |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |  |
Service cost |  |  | $ 1 | $ 0 | $ 0
Interest cost |  |  | 99 | 91 | 64
Expected return on plan assets |  |  | (85) | (79) | (101)
Amortization of transition and prior service costs (credits) |  |  | 0 | 0 | 0
Amortization of actuarial loss |  |  | 39 | 43 | 46
Net periodic benefit cost |  |  | 54 | 55 | 9
Other postretirement charges |  |  | 5 | 3 | 13
ERISA litigation matter |  | $ 267 | 0 | 267 | 0
Total pension cost |  |  | $ 59 | $ 325 | $ 22
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost |  |  |  |  |
Discount rate |  |  | 5.40% | 5.66% | 2.98%
Expected long-term rate of return on plan assets |  |  | 6.50% | 6.25% | 5.70%
Long-term rate of compensation increase |  |  | 3.50% | 3.50% | 3.50%
ESOP growth rate |  |  | 0.00% | 0.00% | 0.00%
Medical cost trend rate of increase |  |  | 0.00% | 0.00% | 0.00%
Interest Crediting Rate |  |  | 4.99% | 5.21% | 2.82%
International | Pension Plans |  |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |  |
Service cost |  |  | $ 16 | $ 15 | $ 15
Interest cost |  |  | 33 | 33 | 21
Expected return on plan assets |  |  | (29) | (25) | (21)
Amortization of transition and prior service costs (credits) |  |  | 1 | 1 | 1
Amortization of actuarial loss |  |  | 5 | 5 | 7
Net periodic benefit cost |  |  | 26 | 29 | 23
Other postretirement charges |  |  | 0 | 2 | 4
ERISA litigation matter |  |  | 0 | 0 | 0
Total pension cost |  |  | $ 26 | $ 31 | $ 27
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost |  |  |  |  |
Discount rate |  |  | 4.61% | 4.75% | 2.10%
Expected long-term rate of return on plan assets |  |  | 5.69% | 4.66% | 2.72%
Long-term rate of compensation increase |  |  | 3.24% | 3.22% | 2.89%
ESOP growth rate |  |  | 0.00% | 0.00% | 0.00%
Medical cost trend rate of increase |  |  | 0.00% | 0.00% | 0.00%
Interest Crediting Rate |  |  | 0.64% | 2.28% | 0.84%

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- Definition Expected growth rate of company stock held by the employee stock ownership plans used to determine benefit obligations for defined benefit plans. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: 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 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: 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 5: 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 Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: 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 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, 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 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + 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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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: 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 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: 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 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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