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Retirement and Other Employee Benefits - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Defined Benefit Plan Disclosure [Line Items]        
Settlement loss $ (16) $ 0 $ (25) $ 0
Retirement age       65 years
Reduction to accumulated postretirement benefit obligation       $ 53
Amortization period       5 years
United Kingdom | Pension Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Settlement loss $ (16)   $ (25)