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Cash and Marketable Securities
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Cash and Marketable Securities [Abstract]    
Cash and Marketable Securities

Note 9. Cash and Marketable Securities

        Cash, money market funds and certificates of deposits with maturities of three months or less when purchased are included in Cash and cash equivalents on the unaudited condensed consolidated statements of financial position. As of September 30, 2014 and December 31, 2013, the Company's investments consisted primarily of domestic publicly traded debt and certificates of deposit ("Debt securities") and common equity securities ("Equity securities"). The amortized cost, fair value and gross unrealized gains and losses of the Company's short- and long-term investments in Debt and Equity securities as of September 30, 2014 and December 31, 2013 were as follows:

(In millions)
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair Value  

Available-for-sale and trading securities, September 30, 2014

                          

Debt securities

   $ 70   $ 1   $ —   $ 71  

Equity securities

     34     8     (1 )   41  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities

   $ 104   $ 9   $ (1 ) $ 112  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Available-for-sale and trading securities, December 31, 2013

                          

Debt securities

   $ 97   $ 3   $ (1 ) $ 99  

Equity securities

     41     9     —     50  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities

   $ 138   $ 12   $ (1 ) $ 149  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

        Unrealized losses which had been in a loss position for more than one year as of September 30, 2014 were less than $1 million. There were no unrealized losses which had been in a loss position for more than one year as of December 31, 2013. The aggregate fair value of the investments with unrealized losses was $17 million and $30 million as of September 30, 2014 and December 31, 2013, respectively.

        Gains and losses on sales of investments, as determined on a specific identification basis, are included in investment income in the period they are realized. The Company periodically reviews its portfolio of investments to determine whether there has been an other than temporary decline in the value of the investments from factors such as deterioration in the financial condition of the issuer or the market(s) in which the issuer competes. The table below summarizes proceeds, gross realized gains, and gross realized losses resulting from sales of available-for-sale securities. There were no impairment charges due to other than temporary declines in the value of certain investments for the nine months ended September 30, 2014 and 2013.

 
   Nine Months
Ended
September 30,		  
(In millions)
  2014   2013  

Proceeds from sale of securities

   $ 43   $ 8  

Gross realized gains, pre-tax

     5     1  

Gross realized gains, net of tax

     3     1  

Gross realized losses, pre-tax

     (1 )   —  

Gross realized losses, net of tax

     —     —  

Note 13. Cash and Marketable Securities

        Cash, money market funds and certificates of deposits with maturities of three months or less when purchased are included in Cash and cash equivalents on the consolidated statements of financial position. As of December 31, 2013 and 2012, the Company's investments consist primarily of domestic publicly traded debt and certificates of deposit ("Debt securities") and common equity securities ("Equity securities"). The amortized cost, fair value and gross unrealized gains and losses of the Company's short- and long-term investments in Debt and Equity securities as of December 31, 2013 and 2012 is as follows:

(In millions)
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value		  

Available-for-sale and trading securities, December 31, 2013:

                          

Debt securities

   $ 97   $ 3   $ (1 ) $ 99  

Equity securities

     41     9     —     50  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities

   $ 138   $ 12   $ (1 ) $ 149  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

(In millions)
  Amortized
Cost		   Gross
Unrealized
Gains		   Gross
Unrealized
Losses		   Fair
Value		  

Available-for-sale and trading securities, December, 31, 2012:

                          

Debt securities

   $ 99   $ 6   $ —   $ 105  

Equity securities

     39     4     (2 )   41  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total securities

   $ 138   $ 10   $ (2 ) $ 146  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

        There were no unrealized losses which had been in a loss position for more than one year as of December 31, 2013. The portion of unrealized losses which had been in a loss position for more than one year was $2 million as of December 31, 2012. The aggregate fair value of the investments with unrealized losses was $30 million and $13 million as of December 31, 2013 and 2012, respectively.

        Gains and losses on sales of investments, as determined on a specific identification basis, are included in investment income in the period they are realized. The Company periodically reviews its portfolio of investments to determine whether there has been an other than temporary decline in the value of the investments from factors such as deterioration in the financial condition of the issuer or the market(s) in which the issuer competes.

        The table below summarizes proceeds, gross realized gains, gross realized losses, each resulting from sales of available-for-sale securities, and impairment charges due to other than temporary declines in the value of certain investments.

 
   Year Ended
December 31,		  
(In millions)
  2013   2012   2011  

Proceeds from sales of securities

   $ 23   $ 23   $ 45  

Gross realized gains, pre-tax

     2     2     6  

Gross realized gains, net of tax

     1     1     4  

Gross realized losses, pre-tax

     (1 )   —     —