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Other Financial Data (Other Current Assets) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 28, 2014
Dec. 31, 2013
Other Current Assets [Abstract]    
Costs and earnings in excess of billings $ 374 $ 390
Contract-related deferred costs 14 15
Tax-related deposits and refunds receivable 64 107
Other 75 123
Other current assets $ 527 $ 635