Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Income Taxes [Line Items]
Total net state income tax expense			$ 127	$ 207		$ 121
U.S. federal statutory income tax rate			35.00%
Recognized tax benefit for the impact of the tax credit			$ 71	66		96
Non-cash goodwill impairment charge	$ 119	$ 195		119	[1],[2]	195	[2]
Net deferred tax (benefit)			(473)	(387)		3
Undistributed earnings of foreign subsidiaries not taxed to U.S. income taxes and foreign withholding taxes	291	$ 222	353	291		222
Estimated additional income tax expense after foreign tax credits on undistributed earnings of foreign companies if remitted			48	55		50
Federal and foreign income tax payments made, net of refunds received			1,800	1,500		787
Refund received from the IRS				200
Lockheed Martin Commercial Flight Training
Income Taxes [Line Items]
Asset impairment charge			90
Net deferred tax (benefit)			$ (80)
Tax benefit reduced the effective income tax rate			1.00%
Tax Year 2012 And 2013
Income Taxes [Line Items]
Recognized tax benefit for the impact of the tax credit						$ 76
Tax Year 2014
Income Taxes [Line Items]
Recognized tax benefit for the impact of the tax credit	$ 45			$ 45
Earliest Tax Year | Internal Revenue Service (IRS)
Income Taxes [Line Items]
Tax years subject to examination			2013
Latest Tax Year | Internal Revenue Service (IRS)
Income Taxes [Line Items]
Tax years subject to examination			2014

[1] The impairment in 2014 relates to our Technical Services reporting unit within our IS&GS business segment (Note 1).

[2] We recognized non-cash goodwill impairment charges related to the Technical Services reporting unit within our MFC business segment in 2014 and 2013. See Note 1 for more information.