Accounts Receivable (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Accounts Receivable [Line Items]
Total accounts receivable	$ 4,204,000,000	$ 4,429,000,000
Non-U.S. Government
Accounts Receivable [Line Items]
Total accounts receivable	2,728,000,000	2,536,000,000
Receivables related to long-term production programs	2,500,000,000
Receivables related to long-term production programs, net of customer advances	28,000,000
U.S. Government
Accounts Receivable [Line Items]
Total accounts receivable	778,000,000	1,039,000,000
Commercial
Accounts Receivable [Line Items]
Total accounts receivable	$ 698,000,000	$ 854,000,000