Retirement Plans and Other Employee Benefits - Projected Benefit Obligation Affected by Interest Crediting Ratings (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, benefit obligation	$ 12	$ 15	$ 16
Interest crediting rate	9.07%	8.20%	9.66%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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