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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, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 2,862 $ 2,882
Fair value of plan assets 2,094 2,007
Accumulated benefit obligation 875 2,689
Fair value of plan assets $ 166 $ 1,924