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Marketable Securities - Schedule of Marketable Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Marketable Securities [Line Items]    
Marketable Securities, Cost $ 21 $ 39
Unrealized Gain (Loss) 0 1
Marketable Securities, Fair Value 21 40
US Treasury and Government [Member]    
Marketable Securities [Line Items]    
Debt Securities, Cost 2 3
Debt Securities, Unrealized Gain 0 0
Debt Securities, Fair Value 2 3
Corporate Debt Securities [Member]    
Marketable Securities [Line Items]    
Debt Securities, Cost 4 5
Debt Securities, Unrealized Gain
Debt Securities, Fair Value 4 5
Certificates of Deposit [Member]    
Marketable Securities [Line Items]    
Debt Securities, Cost 15 27
Debt Securities, Unrealized Gain  
Debt Securities, Fair Value 15 27
Other Securities [Member]    
Marketable Securities [Line Items]    
Equity Securities, Cost 4
Unrealized Gain (Loss)   1
Equity Securities, Fair Value $ 5