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Marketable Securities - Schedule of Marketable Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 157 $ 164
Unrealized Gain (Loss) 0 5
Fair Value 157 169
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost 39 38
Unrealized Gain (Loss) 0 0
Fair Value 39 38
Corporate Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 41 $ 36
Unrealized Gain (Loss)
Fair Value $ 41 $ 36
Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 17 $ 23
Unrealized Gain (Loss)
Fair Value $ 17 $ 23
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 60 67
Unrealized Gain (Loss) 5
Fair Value $ 60 $ 72