| Date | Acquired | Amount |
|---|---|---|
| Apr 28, 2016 |
|
$ 3,800,000,000 |
| Sep 28, 2015 |
|
$ 1,500,000,000 |
| Jul 07, 2008 |
|
Undisclosed amount |
| Oct 09, 2007 |
|
$ 925,000,000 |
| Mar 01, 2006 |
|
Undisclosed amount |
