Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

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:

	Fiscal Years
(Dollars in Millions)	2017			2016		2015
Current:
Federal	$	787		$	540	$	619
State	117			82		95
Subtotal Current	904			622		714
Deferred:
Federal	(3,277		)	355		414
State	44			50		42
Subtotal Deferred	(3,233		)	405		456
Total	$	(2,329	)	$	1,027	$	1,170

Schedule of Income Tax Expense Reconciled to Tax Computed at Statutory Rates

	Fiscal Years
(Dollars In Millions)	2017					2016					2015
Federal Income Taxes	$	1,100		35.0	%	$	959		35.0	%	$	1,098		35.0	%
State Income Taxes	102			3.2	%	83			3.0	%	86			2.7	%
Deferred Tax Rate Change	(3,506		)	(111.6	)%	—			—	%	—			—	%
Other	(25		)	(0.8	)%	(15		)	(0.5	)%	(14		)	(0.4	)%
Income Tax (Benefit) Expense/Rate	$	(2,329	)	(74.2	)%	$	1,027		37.5	%	$	1,170		37.3	%

Schedule of Significant Components of Deferred Income Tax Assets and Liabilities

The significant components of deferred income tax assets and liabilities include:

	2017				2016
(Dollars in Millions)	Assets		Liabilities		Assets		Liabilities
Pension Plans	$	41	$	—	$	125	$	—
Other Employee Benefit Plans	182		—		272		—
Accelerated Depreciation	—		6,576		—		9,925
Other	657		722		225		293
Total	$	880	$	7,298	$	622	$	10,218
Net Deferred Income Tax Liabilities			$	6,418			$	9,596

Schedule of Change to Total Gross Unrecognized Tax Benefits

The change to the total gross unrecognized tax benefits and prior year audit resolutions of the Company during the fiscal year ended December 2017 is reconciled in the table below.

Unrecognized Tax Benefits:	Fiscal Year
(Dollars in Millions)	2017			2016			2015
Balance at beginning of the year	$	25		$	23		$	21
Additions based on tax positions related to current year	1			1			1
Additions based on tax positions related to prior years	4			4			4
Reductions based on tax positions related to prior years	—			—			—
Settlements with taxing authorities	(4		)	—			1
Lapse of statute of limitations	(2		)	(3		)	(4		)
Balance at end of the year	$	24		$	25		$	23