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Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes Recognized in Comprehensive Income |  |  |
Net actuarial (gain) loss during period | $ 550 | $ (1,050) | $ (1,244)
Amortization of actuarial loss | (244) | (599) | (1,069)
Prior service (credits) costs during period | 29 | 96 | 0
Amortization of prior service (costs) credits | 13 | 19 | 14
Other Benefits |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 33 | 43 | 43
Interest cost | 97 | 60 | 53
Expected return on plan assets | 0 | 0 | 0
Amortization of prior service costs (credits) | (25) | (27) | (27)
Recognized actuarial losses | (19) | 13 | 16
Settlement losses | 0 | 0 | 0
Curtailment losses (gains) | 0 | 0 | 0
Special termination benefits | 0 | 0 | 0
Acquisition/Divestiture losses (gains) | 0 | 0 | 0
Total net periodic benefit cost | 86 | 89 | 85
Changes Recognized in Comprehensive Income |  |  |
Net actuarial (gain) loss during period | 108 | (514) | (111)
Amortization of actuarial loss | 19 | (13) | (15)
Prior service (credits) costs during period | 1 | 18 | 0
Amortization of prior service (costs) credits | 25 | 27 | 27
Total changes recognized in other comprehensive income | 153 | (482) | (99)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income | 239 | (393) | (14)
U.S. | Pension Benefits |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 342 | 432 | 450
Interest cost | 448 | 318 | 235
Expected return on plan assets | (557) | (624) | (596)
Amortization of prior service costs (credits) | 4 | 2 | 2
Recognized actuarial losses | 199 | 218 | 309
Settlement losses | 56 | 363 | 672
Curtailment losses (gains) | 0 | 0 | 0
Special termination benefits | 0 | 0 | 0
Acquisition/Divestiture losses (gains) | 0 | 0 | 0
Total net periodic benefit cost | 492 | 709 | 1,072
Changes Recognized in Comprehensive Income |  |  |
Net actuarial (gain) loss during period | 270 | (279) | (725)
Amortization of actuarial loss | (255) | (581) | (981)
Prior service (credits) costs during period | 0 | 40 | 0
Amortization of prior service (costs) credits | (4) | (2) | (2)
Total changes recognized in other comprehensive income | 11 | (822) | (1,708)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income | 503 | (113) | (636)
Int'l. | Pension Benefits |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | 58 | 83 | 123
Interest cost | 193 | 137 | 137
Expected return on plan assets | (204) | (176) | (171)
Amortization of prior service costs (credits) | 8 | 6 | 8
Recognized actuarial losses | 8 | 15 | 46
Settlement losses | 0 | (6) | 7
Curtailment losses (gains) | 2 | (5) | (1)
Special termination benefits | (2) | 0 | 0
Acquisition/Divestiture losses (gains) | 2 | 0 | 0
Total net periodic benefit cost | 65 | 54 | 149
Changes Recognized in Comprehensive Income |  |  |
Net actuarial (gain) loss during period | 172 | (257) | (408)
Amortization of actuarial loss | (8) | (5) | (73)
Prior service (credits) costs during period | 28 | 38 | 0
Amortization of prior service (costs) credits | (8) | (6) | (11)
Total changes recognized in other comprehensive income | 184 | (230) | (492)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income | $ 249 | $ (176) | $ (343)

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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + 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 + Details
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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 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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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -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)(7) -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)(7) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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