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Debt - Schedule of Short and Long Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2019
May 28, 2019
Dec. 31, 2018
Short-Term Debt:      
Short-term borrowings $ 20   $ 0
Long-Term Debt:      
Total Debt 176   0
Convertible Senior Notes | 4% Convertible Senior Dotes due 2024      
Long-Term Debt:      
4.00% Convertible Senior Notes due 2024 (Carrying value) $ 156   $ 0
Stated interest rate 4.00% 4.00%