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Subsequent events
 6 Months Ended
Jun. 30, 2012
Subsequent Events [Abstract]  
Subsequent events
Subsequent events
On July 30, 2012, we announced the pricing of two series of senior unsecured notes for an aggregate principal amount of $1.5 billion.  The notes consist of the following:

•
$750 million of 0.45% notes due August 3, 2015
•
$750 million of 1.65% notes due August 3, 2019
 
We intend to use the net proceeds of this offering for general corporate purposes, which, among other things, could include repurchases of common stock.  The offering is expected to close August 6, 2012.