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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Schedule of components of the income tax expense from continuing operations

The components of the income tax expense from continuing operations are as follows:

			Years Ended December 31,
			2022						2021						2020
			(Dollars in millions)
Income tax expense:
Federal and foreign
Current			$	514					553						425
Deferred			6						17						40
State and local
Current			137						129						128
Deferred			14						10						2
Income tax expense			$	671					709						595

Schedule of effective income tax rate for continuing operations that differs from the statutory tax rate

The effective income tax rate for continuing operations differs from the statutory tax rate as follows:

			Years Ended December 31,
			2022						2021						2020
			(in percent)
Effective income tax rate:
Federal statutory income tax rate			21.0		%				21.0		%				21.0		%
State income taxes-net of federal effect			4.3		%				3.7		%				4.4		%
Other			0.6		%				0.5		%				0.4		%
Effective income tax rate			25.9		%				25.2		%				25.8		%

Schedule of components of the deferred tax assets and liabilities

The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and deferred tax liabilities were as follows:

			As of December 31,
			2022						2021
			(Dollars in millions)
Deferred tax liabilities:
Property, plant and equipment			$	(1,414)					(1,386)
Intangible assets			(114)						(129)
Other			(54)						(25)
Total deferred tax liabilities			(1,582)						(1,540)
Deferred tax assets:
Payable to affiliate due to post-retirement benefit plan participation			302						274
Gross deferred tax assets			302						274
Less valuation allowance on deferred tax assets			—						(8)
Net deferred tax assets			302						266
Net deferred tax liabilities			$	(1,280)					(1,274)

Reconciliation of unrecognized tax benefits

A reconciliation of the change in our gross unrecognized tax benefits (excluding both interest and any related federal benefit) from January 1st to December 31st for 2022 and 2021 are as follows:

			Years ended December 31,
			2022						2021
			(Dollars in millions)
Unrecognized tax benefits at beginning of period			$	360					388
Decrease due to tax positions taken in a prior year			(28)						(28)
Unrecognized tax benefits at end of period			$	332					360

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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.

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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.

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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.

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Tabular disclosure of the change in unrecognized tax benefits.

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