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Revenue (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Revenue [Abstract]          
Capitalized Contract Cost, Net $ 18   $ 18   $ 18
Capitalized Contract Cost, Amortization 6 $ 6 15 $ 16  
Capitalized Contract Cost, Impairment Loss 0 $ 0 0 $ 0  
Deferred revenue 179   $ 179   188
Contracts with customers, period     1 year    
Contract asset 47   $ 47   $ 0
Revenue recognized $ 42   $ 187