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Revenue (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Revenue [Abstract]      
Capitalized Contract Cost, Net $ 17,000,000   $ 16,000,000
Capitalized Contract Cost, Amortization 4,000,000 $ 4,000,000  
Capitalized Contract Cost, Impairment Loss 0 $ 0  
Deferred revenue 167,000,000   121,000,000
Revenue recognized $ 47,000,000   $ 47,000,000