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Acquisition (Narrative) (Details) - Liberty Transaction [Member] $ in Millions | 9 Months Ended | 17 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |
Acquisition agreement date | May 01, 2018 |
Capital stock acquired, percent | 100.00% | 100.00%
Provisional assets |  | $ (5)
Provisional liabilities |  | 23
Provisional goodwill |  | $ 28

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- Definition Date when the business acquisition agreement was executed, in CCYY-MM-DD format. + References No definition available. + Details
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