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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, 2020
Dec. 31, 2019
Net Periodic Benefit Cost    
Net periodic pension cost $ 1 $ 2
Interest cost 4 5
Actuarial loss 3 2
Expected return on plan assets (6) (5)
Benefit Obligations    
Defined Benefit Plan, Benefit Obligation 148 143
Fair value of plan assets 109 100
Underfunded at end of year $ 39 $ 43