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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
Income Tax Disclosure [Abstract] |
Schedule of Breakdown of Income Tax Expense Between Current and Deferred | The breakdown of income tax expense between current and deferred is as follows:
| Years Ended
(Dollars in Millions) | 2023 |  | 2022 |  | 2021
Current: |  |  |
Federal | $ | 852 |  |  | $ | 928 |  |  | $ | 827 |
State | 184 |  |  | 203 |  |  | 176 |
Subtotal Current | $ | 1,036 |  |  | $ | 1,131 |  |  | $ | 1,003 |
Deferred: |  |  |  |  |
Federal | 122 |  |  | 166 |  |  | 166 |
State | 18 |  |  | (49) |  |  | 1 |
Subtotal Deferred | $ | 140 |  |  | $ | 117 |  |  | $ | 167 |
Total Income Tax Expense | $ | 1,176 |  |  | $ | 1,248 |  |  | $ | 1,170 |
Schedule of Income Tax Expense Reconciled to Tax Computed at Statutory Rates | Income tax expense reconciled to the tax computed at statutory rates is presented in the following table.
| Years Ended
(Dollars in Millions) | 2023 |  | 2022 |  | 2021
Federal Income Taxes | $ | 1,027 |  |  | 21.0 | % |  | $ | 1,137 |  |  | 21.0 | % |  | $ | 1,040 |  |  | 21.0 | %
State Income Taxes | 153 |  |  | 3.1 | % |  | 121 |  |  | 2.2 | % |  | 139 |  |  | 2.8 | %
Other | (4) |  |  | (0.1) | % |  | (10) |  |  | (0.1) | % |  | (9) |  |  | (0.2) | %
Income Tax Expense/ Rate | $ | 1,176 |  |  | 24.0 | % |  | $ | 1,248 |  |  | 23.1 | % |  | $ | 1,170 |  |  | 23.6 | %
Schedule of Significant Components of Deferred Income Tax Assets and Liabilities | The significant components of deferred income tax assets and liabilities include:
| 2023 |  | 2022
(Dollars in Millions) | Assets |  | Liabilities |  | Assets |  | Liabilities
Other Employee Benefit Plans | $ | 103 |  |  | $ | — |  |  | $ | 105 |  |  | $ | — |
Accelerated Depreciation | — |  |  | 7,678 |  |  | — |  |  | 7,600 |
Other | 459 |  |  | 630 |  |  | 553 |  |  | 627 |
Total | $ | 562 |  |  | $ | 8,308 |  |  | $ | 658 |  |  | $ | 8,227 |
Net Deferred Income Tax Liabilities |  |  | $ | 7,746 |  |  |  |  | $ | 7,569 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 9 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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