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Investments in Debt and Equity Securities (Details 2) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Less than 12 months    
Fair Value $ 165 $ 572
Unrealized Losses 12 14
12 months or more    
Fair Value 42 96
Unrealized Losses 2 3
Total    
Fair Value 207 668
Unrealized Losses 14 17
Corporate bonds    
Less than 12 months    
Fair Value 64 242
Unrealized Losses 1 3
12 months or more    
Fair Value 27 27
Unrealized Losses 0 1
Total    
Fair Value 91 269
Unrealized Losses 1 4
Asset-backed securities    
Less than 12 months    
Fair Value 15 84
Unrealized Losses 0 1
12 months or more    
Fair Value 9 10
Unrealized Losses 1 1
Total    
Fair Value 24 94
Unrealized Losses 1 2
U.S. governmental agency mortgage-backed securities    
Less than 12 months    
Fair Value   135
Unrealized Losses   1
12 months or more    
Fair Value   57
Unrealized Losses   1
Total    
Fair Value   192
Unrealized Losses   2
Large capitalization value    
Less than 12 months    
Fair Value 76 97
Unrealized Losses 9 8
12 months or more    
Fair Value 5 2
Unrealized Losses 1 0
Total    
Fair Value 81 99
Unrealized Losses 10 8
Smaller company growth    
Less than 12 months    
Fair Value 10 14
Unrealized Losses 2 1
12 months or more    
Fair Value 1 0
Unrealized Losses 0 0
Total    
Fair Value 11 14
Unrealized Losses $ 2 $ 1