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Available-For-Sale Securities (Details 2) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Less than 12 months    
Fair Value $ 267 $ 244
Unrealized Losses 12 3
12 months or more    
Fair Value 84 173
Unrealized Losses 1 3
Total    
Fair Value 351 417
Unrealized Losses 13 6
Corporate bonds    
Less than 12 months    
Fair Value 155 195
Unrealized Losses 2 1
12 months or more    
Fair Value 23 32
Unrealized Losses 0 0
Total    
Fair Value 178 227
Unrealized Losses 2 1
U.S. governmental agency mortgage-backed securities    
Less than 12 months    
Fair Value 15 34
Unrealized Losses 0 0
12 months or more    
Fair Value 60 140
Unrealized Losses 1 3
Total    
Fair Value 75 174
Unrealized Losses 1 3
Large capitalization value    
Less than 12 months    
Fair Value 84 15
Unrealized Losses 8 2
12 months or more    
Fair Value 1 1
Unrealized Losses 0 0
Total    
Fair Value 85 16
Unrealized Losses 8 $ 2
Smaller company growth    
Less than 12 months    
Fair Value 13  
Unrealized Losses 2  
12 months or more    
Fair Value 0  
Unrealized Losses 0  
Total    
Fair Value 13  
Unrealized Losses $ 2