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Employee Benefit Plans (Net Periodic Costs (Components of Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in OCI | $ (21) | $ (166) | $ 363
Pension Plans | Qualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 128 | 130 | 142
Interest cost | 240 | 249 | 156
Expected return on plan assets | (358) | (324) | (298)
Amortization of prior service cost | 4 | 4 | 3
Net periodic cost | 14 | 59 | 3
Amortization of prior service (cost) | (4) | (4) | (3)
Current year actuarial loss/(gain) | (13) | (173) | 508
Total recognized in OCI | (17) | (177) | 505
Total amounts recognized in net periodic cost and OCI | (3) | (118) | 508
Pension Plans | Nonqualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 3 | 3 | 3
Interest cost | 11 | 11 | 7
Amortization of actuarial loss/(gain) | 1 | 1 | 5
Net periodic cost | 15 | 15 | 15
Current year actuarial loss/(gain) |  | 3 | (44)
Amortization of actuarial gain/(loss) | (1) | (1) | (5)
Total recognized in OCI | (1) | 2 | (49)
Total amounts recognized in net periodic cost and OCI | 14 | 17 | (34)
Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 3 | 3 | 4
Interest cost | 13 | 14 | 9
Expected return on plan assets | (11) | (10) | (6)
Amortization of actuarial loss/(gain) | (1) |  |
Net periodic cost | 4 | 7 | 7
Current year actuarial loss/(gain) | (4) | 1 | (30)
Amortization of actuarial gain/(loss) | 1 |  |
Total recognized in OCI | (3) | 1 | (30)
Total amounts recognized in net periodic cost and OCI | $ 1 | $ 8 | $ (23)

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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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