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Goodwill And Intangible Assets (Composition Of Goodwill And Intangible Assets) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Indefinite-lived Intangible Assets [Line Items]        
Goodwill $ 149   $ 148 $ 85
Total intangible assets 61   72  
Accumulated amortization (30)   (27)  
Total intangible assets, net 31   45  
Impairment of digital assets 11 $ 7    
Licenses and Others [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 13   13  
Non-Compete Agreement [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 4   4  
Customer Lists [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 12   13  
Trademarks [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 8   7  
Hub Network [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 4   3  
Other Intangible Assets [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Amortizable intangible assets 3   3  
Trademarks [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets with indefinite lives 7   8  
Digital Assets [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets with indefinite lives [1] 10   21  
Impairment of digital assets $ 20   $ 9  
[1] Digital assets are net of $20 million and $9 million of impairment losses as of June 30, 2022 and December 31, 2021.