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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, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 805 $ 1,092
Fair value of plan assets 82 299
Accumulated benefit obligation 771 882
Fair value of plan assets $ 81 $ 134