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Acquisitions And Divestitures Acquisition of Dynawave (Details) - USD ($)
$ in Millions
Aug. 04, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill   $ 2,511 $ 2,580 $ 2,407
Dynawave [Member]        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%      
Business Combination, Consideration Transferred $ 22      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 8      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 12      
Goodwill 10      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 22      
Other assets purchased and liabilities assumed, net $ 4      
Dynawave [Member] | Customer Relationships [Member]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 9 years