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Employee Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Pension Benefits |  |  |  |
Net periodic benefit costs [Abstract] |  |  |  |
Service costs | $ 41 | $ 38 | $ 122 | $ 113
Interest costs | 114 | 118 | 342 | 353
Expected return on plan assets | (115) | (119) | (345) | (360)
Amortization of net actuarial (gains) losses | 42 | 40 | 125 | 118
Amortization of prior service costs (credit) | (3) | (3) | (9) | (9)
Net periodic benefit costs (credit) | 79 | 74 | 235 | 215
Other Postretirement Benefits |  |  |  |
Net periodic benefit costs [Abstract] |  |  |  |
Service costs | 0 | 1 | 2 | 2
Interest costs | 10 | 11 | 30 | 32
Expected return on plan assets | (14) | (13) | (42) | (41)
Amortization of net actuarial (gains) losses | (7) | (7) | (21) | (22)
Amortization of prior service costs (credit) | 0 | 0 | 0 | 0
Net periodic benefit costs (credit) | $ (11) | $ (8) | $ (31) | $ (29)

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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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