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Accumulated Other Comprehensive Loss | 12 Months Ended
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Dec. 31, 2024
Accumulated Other Comprehensive Loss [Abstract] |
Accumulated Other Comprehensive Loss | NOTE 20. ACCUMULATED O THER COMPREHENSIVE LOSS Accumulated Other Comprehensive Loss Accumulated other comprehensive loss, net of tax, was immaterial as of December 31, 2024 and December 31, 2023. The following table details the reclassifications out of accumulated other comprehensive loss by component for the years ended December 31 (dollars in millions):
|  | Amounts Reclassified from Accumulated Other Comprehensive Loss |
Details about Accumulated Other Comprehensive Loss Components (Affected Line Item in Statements of Income) |  | 2024 |  |  | 2023 |  |  | 2022 |
Amortization of defined benefit pension and postretirement benefit items |  |  |  |  |  |  |  |  |
Amortization of net prior service cost (a) |  | $ | 1 |  |  | $ | (1 | ) |  | $ | (4 | )
Amortization of net loss (a) |  |  | (12 | ) |  |  | 19 |  |  |  | 57 |
Adjustment due to effects of regulation (a) |  |  | 11 |  |  |  | (16 | ) |  |  | (42 | )
Total before tax (b) |  |  | — |  |  |  | 2 |  |  |  | 11 |
Tax expense (b) |  |  | — |  |  |  | — |  |  |  | (2 | )
Net of tax (b) |  | $ | — |  |  | $ | 2 |  |  | $ | 9 |
(a) These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 12 for additional details). (b) Description is also the affected line item on the Consolidated Statements of Income.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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