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Investments in Debt and Equity Securities (Details 2) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Less than 12 months    
Fair Value $ 661 $ 587
Unrealized Losses 12 9
12 months or more    
Fair Value 138 163
Unrealized Losses 5 5
Total    
Fair Value 799 750
Unrealized Losses 17 14
Corporate bonds    
Less than 12 months    
Fair Value 501 312
Unrealized Losses 9 2
12 months or more    
Fair Value 35 38
Unrealized Losses 1 0
Total    
Fair Value 536 350
Unrealized Losses 10 2
U.S. governmental agency mortgage-backed securities    
Less than 12 months    
Fair Value 160 129
Unrealized Losses 3 1
12 months or more    
Fair Value 103 110
Unrealized Losses 4 3
Total    
Fair Value 263 239
Unrealized Losses $ 7 4
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