Accounts Receivable (Schedule Of Accounts Receivable Under Long-Term Contracts) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Unbilled Receivables, Not Billable, Fiscal Year Maturity [Abstract]
Unbillable, current	$ 1,550	$ 1,316
Unbillable, expected to be collected after one year	1,020	730
Total Unbillable	2,570	2,046
Contracts Receivable, Claims and Uncertain Amounts, Fiscal Year Maturity [Abstract]
Claims, current	3	26
Claims, expected to be collected after one year	61	63
Total Claims	$ 64	$ 89