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Stock Option Plans and Stock Based Compensation Stock Based Compensation Plans (Details) - USD ($)
$ / shares in Millions, $ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture $ 8 $ 0 $ 0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 7,635,389    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,034,100    
Share-based Compensation Arrangement by Share-based payment award, PSUs, Nonvested, Number 2,412,894    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 16    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 29