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Redeemable Noncontrolling Interest (Tables)
6 Months Ended
Jun. 30, 2013
Redeemable Noncontrolling Interests [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block]
The following table summarizes the changes in our redeemable noncontrolling interest for the period ended June 30 (in millions):
 
2013
Balance on December 31, 2012
$
322

Accretion to the redemption value of noncontrolling interest (recognized in Interest expense)
5

Ending balance
$
327