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Note 21. Subsequent Events Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]    
Business Acquisition, Share Price $ 14  
Business Combination, Consideration Transferred $ 375 $ 77
Business Combination, Consideration Transferred, Other $ 53