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Employee Benefits - Defined Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Plan assets	$ 128	$ 122
Benefit obligation	161	140
Unfunded status	$ 33	$ 18

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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