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Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Service cost | $ 1 | $ 1 | $ 3 | $ 2 | $ 2 | $ 3 | $ 3
Interest cost | 659 | 705 | 1,318 | 1,410 | 2,820 | 2,080 | 1,988
Expected return on plan assets | (827) | (859) | (1,656) | (1,720) | (3,441) | (3,789) | (3,848)
Amortization of prior service credits | (21) | (21) | (41) | (41) | (81) | (81) | (80)
Recognized net actuarial loss | 67 | 41 | 134 | 83 | 173 | 913 | 1,219
Settlement/curtailment (gain)/loss |  |  |  |  |  | (4) | 193
Net periodic benefit income | (121) | (133) | (242) | (266) | (527) | (878) | (525)
Postretirement |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Service cost | 13 | 12 | 25 | 24 | 49 | 72 | 87
Interest cost | 31 | 37 | 62 | 74 | 148 | 98 | 97
Expected return on plan assets | (4) | (2) | (6) | (4) | (9) | (10) | (7)
Amortization of prior service credits | (2) | (5) | (5) | (11) | (22) | (35) | (35)
Recognized net actuarial loss | (44) | (44) | (88) | (88) | (175) | (111) | (56)
Net periodic benefit income | (6) | (2) | (12) | (5) | (9) | 14 | 86
Operating Income (Loss) | Pension |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes | 1 | 1 | 3 | 2 | 2 | 3 | 3
Operating Income (Loss) | Postretirement |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes | 12 | 16 | 23 | 31 | 62 | 79 | 90
Other Income | Pension |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes | (122) | (134) | (245) | (268) | (529) | (881) | (528)
Other Income | Postretirement |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes | (19) | (14) | (37) | (29) | (58) | (58) | (1)
Operating Income (Loss) Before Taxes | Pension |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes | (121) | (133) | (242) | (266) | (527) | (878) | (525)
Operating Income (Loss) Before Taxes | Postretirement |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes | $ (7) | $ 2 | $ (14) | $ 2 | $ 4 | $ 21 | $ 89

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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 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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