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Equity (Tables)
3 Months Ended
Mar. 31, 2013
Equity [Abstract]  
Share repurchases
Share repurchases for the three months ended March 31 were as follows: 
(in millions, except average price)
2013
 
2012
Total number of shares purchased 1
7.2

 
0.8

Average price paid per share
$

 
$

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 three months ended March 31, 2013 were as follows:
(in millions)
 
Opening redeemable noncontrolling interest
$
810

Net income attributable to noncontrolling interest
18

Distributions to noncontrolling interest
(16
)
Redemption value adjustment
(2
)
Ending redeemable noncontrolling interest
$
810