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Acquisitions, Divestitures and Exchanges (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Acquisitions, divestitures and exchanges  
Goodwill $ 38
Continuum  
Acquisitions, divestitures and exchanges  
Purchase price 80
Goodwill 38
Intangible assets subject to amortization 9
Net tangible assets (liabilities) $ 33
Weighted average amortization period 4 years