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Equity (Tables)
6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Share repurchases
Share repurchases for the periods ended June 30 were as follows: 
(in millions, except average price)
Three Months
 
Six Months
 
2013
 
2012
 
2013
 
2012
Total number of shares purchased 1
1.4

 
0.1

 
8.6

 
0.9

Total cash utilized
$

 
$

 
$
500

 
$

1 
2013 and 2012 include shares received as part of our accelerated share repurchase agreements described in more detail below.

Redeemable Noncontrolling Interest
Changes to redeemable noncontrolling interest during the six months ended June 30, 2013 were as follows:
(in millions)
 
Redeemable noncontrolling interest as of December 31, 2012
$
810

Net income attributable to noncontrolling interest
38

Distributions to noncontrolling interest
(32
)
Redemption value adjustment
(6
)
Redeemable noncontrolling interest as of June 30, 2013
$
810