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Investments in Debt and Equity Securities (Details 2) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Less than 12 months    
Fair Value $ 98 $ 572
Unrealized Losses 9 14
12 months or more    
Fair Value 25 96
Unrealized Losses 2 3
Total    
Fair Value 123 668
Unrealized Losses 11 17
Corporate bonds    
Less than 12 months    
Fair Value   242
Unrealized Losses   3
12 months or more    
Fair Value   27
Unrealized Losses   1
Total    
Fair Value   269
Unrealized Losses   4
Asset-backed securities    
Less than 12 months    
Fair Value 0 84
Unrealized Losses 0 1
12 months or more    
Fair Value 16 10
Unrealized Losses 1 1
Total    
Fair Value 16 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 85 97
Unrealized Losses 6 8
12 months or more    
Fair Value 9 2
Unrealized Losses 1 0
Total    
Fair Value 94 99
Unrealized Losses 7 8
Smaller company growth    
Less than 12 months    
Fair Value 13 14
Unrealized Losses 3 1
12 months or more    
Fair Value 0 0
Unrealized Losses 0 0
Total    
Fair Value 13 14
Unrealized Losses $ 3 $ 1