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Retirement Plans and Other Retiree Benefits (Details 5) - Pension Plan - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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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

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