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Marketable Securities - Schedule of Marketable Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 38 $ 30
Unrealized Gain (Loss) 0 0
Fair Value 38 30
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 3 2
Unrealized Gain (Loss) 0 0
Fair Value 3 2
Corporate Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 5 2
Unrealized Gain (Loss)
Fair Value 5 2
Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 25 22
Unrealized Gain (Loss)
Fair Value 25 22
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 5 4
Unrealized Gain (Loss)
Fair Value $ 5 $ 4