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Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 3 | $ 2 | $ 7 | $ 5
Interest cost | 669 | 658 | 2,007 | 1,976
Expected return on plan assets | (769) | (827) | (2,308) | (2,483)
Amortization of prior service credits | (18) | (20) | (55) | (61)
Recognized net actuarial loss | 76 | 66 | 229 | 200
Net periodic benefit income | (39) | (121) | (120) | (363)
Postretirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 13 | 13 | 38 | 38
Interest cost | 34 | 31 | 102 | 93
Expected return on plan assets | (3) | (2) | (9) | (8)
Amortization of prior service credits | (1) | (3) | (1) | (8)
Recognized net actuarial loss | (35) | (44) | (106) | (132)
Net periodic benefit income | 8 | (5) | 24 | (17)
Operating Income (Loss) | Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes | 3 | 2 | 7 | 5
Operating Income (Loss) | Postretirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes | 13 | 12 | 38 | 35
Other Income | Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes | (42) | (123) | (127) | (368)
Other Income | Postretirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes | (5) | (18) | (14) | (55)
Operating Income (Loss) Before Taxes | Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes | (39) | (121) | (120) | (363)
Operating Income (Loss) Before Taxes | Postretirement |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes | $ 8 | $ (6) | $ 24 | $ (20)

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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 cost for actuarial present value of benefits attributed to service rendered by employee for 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/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 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(1) -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)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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