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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Provisions for Income Taxes

			2023						2022						2021
			($ in millions)
Current:
Federal			$	437					$	645					$	553
State			105						132						136
Total current taxes			542						777						689
Deferred:
Federal			(27)						206						186
State			(22)						(123)						(2)
Total deferred taxes			(49)						83						184
Income taxes			$	493					$	860					$	873

Reconciliation of Statutory Rate to Effective Rate

“Income taxes” on the Consolidated Statements of Income differs from the amounts computed by applying the statutory federal corporate tax rate as follows:

 

			2023												2022												2021
			Amount						%						Amount						%						Amount						%
			($ in millions)
Federal income tax at statutory rate			$	487					21.0						$	867					21.0						$	814					21.0
State income taxes, net of federal tax effect			65						2.9						143						3.5						139						3.6
Tax credits			(27)						(1.2)						(10)						(0.2)						(10)						(0.3)
State law changes			—						—						(136)						(3.3)						(34)						(0.8)
Other, net			(32)						(1.4)						(4)						(0.2)						(36)						(1.0)
Income taxes			$	493					21.3						$	860					20.8						$	873					22.5

Schedule of Deferred Tax Assets and Liabilities

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

			December 31,
			2023						2022
			($ in millions)
Deferred tax assets:
Accruals, including casualty and other claims			$	360					$	110
Compensation and benefits, including postretirement benefits			55						99
Other			155						164
Total gross deferred tax assets			570						373
Less valuation allowance			(31)						(41)
Net deferred tax assets			539						332
Deferred tax liabilities:
Property			(7,218)						(7,050)
Other			(546)						(547)
Total deferred tax liabilities			(7,764)						(7,597)
Deferred income taxes			$	(7,225)					$	(7,265)

Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:

			December 31,
			2023						2022
			($ in millions)
Balance at beginning of year			$	22					$	21
Additions based on tax positions related to the current year			30						3
Additions for tax positions of prior years			9						1
Reductions for tax positions of prior years			(1)						—
Settlements with taxing authorities			—						(2)
Lapse of statutes of limitations			(5)						(1)
Balance at end of year			$	55					$	22

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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 for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months.

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