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Investments in Debt and Equity Securities (Details 2) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Less than 12 months    
Fair Value $ 625 $ 587
Unrealized Losses 11 9
12 months or more    
Fair Value 262 163
Unrealized Losses 12 5
Total    
Fair Value 887 750
Unrealized Losses 23 14
Corporate bonds    
Less than 12 months    
Fair Value 498 312
Unrealized Losses 8 2
12 months or more    
Fair Value 93 38
Unrealized Losses 3 0
Total    
Fair Value 591 350
Unrealized Losses 11 2
U.S. governmental agency mortgage-backed securities    
Less than 12 months    
Fair Value 119 129
Unrealized Losses 3 1
12 months or more    
Fair Value 163 110
Unrealized Losses 8 3
Total    
Fair Value 282 239
Unrealized Losses 11 4
Commercial    
Less than 12 months    
Fair Value 8  
Unrealized Losses 0  
12 months or more    
Fair Value 6  
Unrealized Losses 1  
Total    
Fair Value 14  
Unrealized Losses $ 1  
Large capitalization value    
Less than 12 months    
Fair Value   129
Unrealized Losses   5
12 months or more    
Fair Value   14
Unrealized Losses   2
Total    
Fair Value   143
Unrealized Losses   7
Smaller company growth    
Less than 12 months    
Fair Value   17
Unrealized Losses   1
12 months or more    
Fair Value   1
Unrealized Losses   0
Total    
Fair Value   18
Unrealized Losses   $ 1