Accounts Receivable, Net (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Accounts Receivables [Line Items]
Total accounts receivable	$ 3,018,000,000	$ 3,356,000,000
Allowance for doubtful accounts	(54,000,000)	(27,000,000)
Total accounts receivable, net	2,964,000,000	3,329,000,000
Accounts Receivable (Amounts in Paragraphs)
Progress payments	6,400,000,000	5,700,000,000
Receivables expected to be collected in 2013	3,000,000
Receivables expected to be collected in 2014 and later	5,000,000
U.S. Government Sales including Foreign Military Sales
Accounts Receivables [Line Items]
Amounts billed	812,000,000	900,000,000
Recoverable costs and accrued profit on progress completed - unbilled	1,594,000,000	1,718,000,000
Total accounts receivable	2,406,000,000	2,618,000,000
Other Customers
Accounts Receivables [Line Items]
Amounts billed	249,000,000	280,000,000
Recoverable costs and accrued profit on progress completed - unbilled	363,000,000	458,000,000
Total accounts receivable	$ 612,000,000	$ 738,000,000