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Changes in Benefit Obligations and Plan Assets Table (Details) - Defined Benefit Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Net Periodic Benefit Cost    
Net periodic pension cost $ 0 $ 1
Interest cost 3 4
Actuarial loss 3 3
Expected return on plan assets (6) (6)
Benefit Obligations    
Defined Benefit Plan, Benefit Obligation 137 148
Fair value of plan assets 116 109
Underfunded at end of year $ 21 $ 39