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Revenue (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Revenue [Abstract]          
Capitalized Contract Cost, Net $ 14,000,000   $ 14,000,000   $ 16,000,000
Capitalized Contract Cost, Amortization 5,000,000 $ 6,000,000 8,000,000 $ 10,000,000  
Capitalized Contract Cost, Impairment Loss 0 $ 0      
Contract asset 14,000,000   14,000,000    
Revenue recognized $ 47,000,000   $ 94,000,000