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Property, Equipment and Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Depreciation and amortization       $ 26 $ 25 $ 25
Scenario, Forecast [Member]            
Amortization of Intangible Assets $ 4 $ 11 $ 18