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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Equity impact of common stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Percent discount applied to worker's compensation reserve liability to reduce the reserve to present value.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2011
Change in Accounting Estimate
Shares of common stock outstanding after spin-off	49,600,000				49,600,000	48,800,000		48,765,841
Dividends declared, per share	$ 0.10				$ 0.10
Dividends declared					$ (5)
Amount authorized for stock repurchase program					150
Stock Repurchase Program, Period in Force					3 years
Repurchased shares of treasury stock					31,008
Treasury stock activity					1
Independent research and development					21	24	23
Asset Retirement Obligation, Roll Forward Analysis
Balance, beginning				25	25	20	3
Obligation relating to the future retirement of a facility					1	5	17
Revision of estimate					(3)
Accretion expense					2
Balance, ending	25				25	25	20
Valuation allowance	21				21	18
IncomeTaxExaminationPercentageLikelihoodOfUnfavorableSettlement					50.00%
Cash and Cash Equivalents, Maturity Period					90 days
Workers' compensation discount					1.59%	3.05%
Workers' compensation benefit obligations on an undiscounted basis	719				719	739
AOCI amortization period					10 years
Defined Benefit Plan Amortization Of Gains (Losses), Threshold					10.00%
Estimated average remaining service life, amortization period					10 years
Accumulated other comprehensive income (loss)	(1,226)				(1,226)	(862)	(532)
Tax benefit on defined benefit plan accumulated other comprehensive income (loss)	802				802	561
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate
Increase (decrease) in operating income due to net cumulative catch-up adjustments					62	54	(79)
Increase (decrease) in diluted earnings per share due to net cumulative catch-up adjustments					$ 0.80	$ 1.10	$ (1.63)
LHD-8 USS Makin Island [Member] \| Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate
Increase (decrease) in operating income due to net cumulative catch-up adjustments							$ (30)