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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Trading Securities [Table Text Block]
The following table summarizes the fair value of investments held as of December 31, 2016 and December 31, 2015 (in millions):
 
 
December 31, 2016
 
December 31, 2015
Debt securities
 
$
47

 
$
57

Equity securities
 
60

 
63

  Total
 
$
107

 
$
120
Realized Gain (Loss) on Investments [Table Text Block]
The following table presents gains and losses recognized in earnings for the Company (in millions):
 
 
December 31, 2016
 
December 31, 2015
 
December 31, 2014
Gains
 
$
12

 
$
6

 
$
—

Losses
 
(6
)
 
(11
)
 
—

Net Gain (Loss)
 
$
6

 
$
(5
)
 
$
—