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Accumulated Other Comprehensive Income (Loss), Net of Tax - Schedule of Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | $ (179) | $ (550) | $ (350)
Other Comprehensive Income (Loss) before Reclassifications | 43 | 146 | (230)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 3 | 225 | 30
Net Current Period Other Comprehensive Income (Loss) | 46 | 371 | (200)
Accumulated Other Comprehensive Income (Loss), Ending Balance | (133) | (179) | (550)
Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | 3 | (3) | (6)
Other Comprehensive Income (Loss) before Reclassifications | 42 | 9 | 0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (9) | (3) | 3
Net Current Period Other Comprehensive Income (Loss) | 33 | 6 | 3
Accumulated Other Comprehensive Income (Loss), Ending Balance | 36 | 3 | (3)
Pension and OPEB Plans [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (102) | (426) | (355)
Other Comprehensive Income (Loss) before Reclassifications | 19 | 76 | (72)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 7 | 248 | 1
Net Current Period Other Comprehensive Income (Loss) | 26 | 324 | (71)
Accumulated Other Comprehensive Income (Loss), Ending Balance | (76) | (102) | (426)
Available-for-Sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Accumulated Other Comprehensive Income (Loss), Beginning Balance | (80) | (121) | 11
Other Comprehensive Income (Loss) before Reclassifications | (18) | 61 | (158)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 5 | (20) | 26
Net Current Period Other Comprehensive Income (Loss) | (13) | 41 | (132)
Accumulated Other Comprehensive Income (Loss), Ending Balance | $ (93) | $ (80) | $ (121)

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- Definition Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480016/944-40-65-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14 + Details
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