Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

The provision for federal and foreign income taxes consisted of the following: 

(In millions)	2019			2018			2017
Current income tax expense (benefit)
Federal	$	638		$	245		$	822
Foreign	48			43			40
State	—			—			—
Deferred income tax expense (benefit)
Federal	(26		)	(42		)	235
Foreign	1			15			18
State	(3		)	3			(1		)
Total	$	658		$	264		$	1,114

Schedule of Effective Income Tax Rate Reconciliation

The expense for income taxes differed from the U.S. statutory rate due to the following: 

	2019		2018		2017
Statutory tax rate	21.0	%	21.0	%	35.0	%
Foreign derived intangible income (FDII)	(3.3	)	(4.2	)	—
Research and development tax credit (R&D tax credit)	(2.3	)	(2.4	)	(1.5	)
Equity compensation	(0.3	)	(1.0	)	(1.2	)
Foreign income tax rate differential	0.8		1.3		0.2
Prior year true-up	0.4		(1.1	)	0.1
Tax benefit related to discretionary pension contributions	—		(3.0	)	—
R&D tax credit claims related to the 2014–2017 tax years	—		(2.1	)	—
Irish restructuring	—		(2.0	)	—
Change in valuation allowance	—		2.0		—
Domestic manufacturing deduction benefit	—		—		(2.5	)
Remeasurement of deferred taxes	—		—		3.2
One-time transition tax on previously undistributed foreign earnings	—		—		2.3
Other items, net	0.2		(0.1	)	0.2
Effective tax rate	16.5	%	8.4	%	35.8	%

Schedule of domestic and foreign income from continuing operations before taxes

(In millions)	2019		2018		2017
Domestic income from continuing operations before taxes	$	3,889	$	2,937	$	3,027
Foreign income from continuing operations before taxes	97		210		86

Schedule of income taxes paid (received)

We made (received) the following net tax payments (refunds) during the years ended December 31:

(In millions)	2019		2018			2017
Federal	$	754	$	(69	)	$	765
Foreign	43		63			77
State	34		23			36

Schedule of Unrecognized Tax Benefits Roll Forward

A rollforward of our unrecognized tax benefits was as follows: 

(In millions)	2019			2018			2017
Unrecognized tax benefits, beginning of year	$	92		$	9		$	7
Additions based on current year tax positions	46			20			1
Additions based on prior year tax positions	90			68			4
Reductions based on prior year tax positions	—			(5		)	(1		)
Settlements based on prior year tax positions	(1		)	—			(2		)
Unrecognized tax benefits, end of year	$	227		$	92		$	9

Schedule of Deferred Tax Assets and Liabilities

Deferred income taxes consisted of the following at December 31:

(In millions)	2019			2018
Noncurrent deferred tax assets (liabilities)
Accrued employee compensation and benefits	$	246		$	209
Other accrued expenses and reserves	(21		)	77
Contract balances and inventories	(611		)	(494		)
Pension benefits	1,701			1,306
Other retiree benefits	68			67
Operating lease right-of-use assets	(204		)	(187		)
Operating lease liabilities	214			196
Net operating loss and tax credit carryforwards	405			83
Depreciation and amortization	(921		)	(827		)
Partnership outside basis difference	(25		)	(29		)
Other	21			12
Valuation allowance	(360		)	(84		)
Deferred income taxes—noncurrent	$	513		$	329