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Employee Benefits - Defined Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Plan assets	$ 75	$ 128
Benefit obligation	92	161
Unfunded status	$ 17	$ 33

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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