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Intangible Assets (Summary) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying value $ 1,717 $ 1,717
Accumulated amortization (201) (132)
Net carrying value 1,516 1,585
Total intangible assets, Gross carrying value 1,721 1,721
Total intangible assets, Net carrying value 1,520 1,589
Programs and contract intangibles    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying value 1,450 1,450
Accumulated amortization (57) (25)
Net carrying value 1,393 1,425
Backlog    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying value 200 200
Accumulated amortization (91) (54)
Net carrying value 109 146
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying value 6 6
Accumulated amortization (5) (5)
Net carrying value 1 1
Software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying value 61 61
Accumulated amortization (48) (48)
Net carrying value 13 13
Trade names    
Acquired Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 4 $ 4