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Intangible Assets (Summary) (Details) - USD ($)
$ in Millions
Sep. 28, 2018
Dec. 29, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying value $ 1,100 $ 1,264
Accumulated amortization (402) (412)
Net carrying value 698 852
Total intangible assets, Gross carrying value 1,104 1,268
Total intangible assets, Net carrying value 702 856
Trade names    
Acquired Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 4 4
Program and contract intangibles    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying value 1,004 1,013
Accumulated amortization (327) (187)
Net carrying value 677 826
Software and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying value 92 89
Accumulated amortization (71) (64)
Net carrying value 21 25
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying value 4 4
Accumulated amortization (4) (3)
Net carrying value 0 1
Backlog    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross carrying value 0 158
Accumulated amortization 0 (158)
Net carrying value $ 0 $ 0