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Investments (Tables)
 9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Trading Securities [Table Text Block]
The following table summarizes the fair value of investments held as of September 30, 2016 and December 31, 2015 (in millions):
 
 
September 30, 2016
 
December 31, 2015
Debt securities
 
$
48

 
$
57

Equity securities
 
59

 
63

  Total
 
$
107

 
$
120
Recognized Gain (Loss) on Investments [Table Text Block]
The following table presents gains and losses recognized in earnings for the Company (in millions):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2016
 
2015
 
2016
 
2015
Gains
 
$
4

 
$
1

 
$
11

 
$
1

Losses
 
—

 
(6
)
 
(4
)
 
(8
)
  Net Gain (Loss)
 
$
4

 
$
(5
)
 
$
7

 
$
(7
)