| Date | Acquired | Amount |
|---|---|---|
| Dec 29, 2014 |
|
$ 11,970,000,000 |
| Sep 10, 2013 |
|
Undisclosed amount |
| Mar 24, 2011 |
|
$ 409,000,000 |
| Feb 17, 2010 |
|
$ 1,100,000,000 |
| Jun 06, 2006 |
|
Undisclosed amount |
