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Derivative Financial Instruments, Investments and Fair Value Measurements - Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Dividend income $ 1 $ 0
Unrealized Gain 30 0
Investment income from marketable securities $ 31 $ 0