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Investments in Debt and Equity Securities (Details 2) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Less than 12 months    
Fair Value $ 309 $ 376
Unrealized Losses 9 10
12 months or more    
Fair Value 34 38
Unrealized Losses 1 3
Total    
Fair Value 343 414
Unrealized Losses 10 13
Corporate bonds    
Less than 12 months    
Fair Value 121 131
Unrealized Losses 1 1
12 months or more    
Fair Value 12 13
Unrealized Losses 0 0
Total    
Fair Value 133 144
Unrealized Losses 1 1
U.S. governmental agency mortgage-backed securities    
Less than 12 months    
Fair Value 140 167
Unrealized Losses 2 2
12 months or more    
Fair Value 12 11
Unrealized Losses 0 0
Total    
Fair Value 152 178
Unrealized Losses 2 2
Large capitalization value    
Less than 12 months    
Fair Value 42 68
Unrealized Losses 5 6
12 months or more    
Fair Value 8 11
Unrealized Losses 1 2
Total    
Fair Value 50 79
Unrealized Losses 6 8
Smaller company growth    
Less than 12 months    
Fair Value 6 10
Unrealized Losses 1 1
12 months or more    
Fair Value 2 3
Unrealized Losses 0 1
Total    
Fair Value 8 13
Unrealized Losses $ 1 $ 2