Accounts Receivable, Net (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Accounts Receivables [Line Items]
Progress payments	$ 5,000,000,000	$ 6,400,000,000
Accounts Receivable, Net [Abstract]
Total accounts receivable	2,918,000,000	3,018,000,000
Allowance for doubtful accounts	(60,000,000)	(54,000,000)
Total accounts receivable, net	2,858,000,000	2,964,000,000
U.S. Government Sales including Foreign Military Sales
Accounts Receivable, Net [Abstract]
Amounts billed	794,000,000	812,000,000
Recoverable costs and accrued profit on progress completed - unbilled	1,396,000,000	1,594,000,000
Total accounts receivable	2,190,000,000	2,406,000,000
Other Customers
Accounts Receivable, Net [Abstract]
Amounts billed	314,000,000	249,000,000
Recoverable costs and accrued profit on progress completed - unbilled	414,000,000	363,000,000
Total accounts receivable	$ 728,000,000	$ 612,000,000