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Retirement Plans and Other Retiree Benefits (Details 5) - Pension Plan - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure - Plans with Projected Obligations in Excess of Plan Assets and Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Line Items]    
Projected benefit obligation $ 2,973 $ 2,667
Fair value of plan assets 2,024 1,792
Accumulated benefit obligation 2,840 2,499
Fair value of plan assets $ 2,003 $ 1,772