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Retirement Plans and Other Retiree Benefits - Benefit Obligation Exceeds Fair Value of Plan Assets (Details) - Pension Plans - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
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 $ 2,882 $ 2,834
Fair value of plan assets 2,007 1,992
Accumulated benefit obligation 2,689 2,641
Fair value of plan assets $ 1,924 $ 1,905