| Date | Acquired | Amount |
|---|---|---|
| Apr 16, 2016 |
|
$ 575,000,000 |
| Dec 17, 2015 |
|
$ 5,700,000,000 |
| Nov 06, 2015 |
|
$ 2,700,000,000 |
| Jul 30, 2014 |
|
Undisclosed amount |
| Oct 15, 2013 |
|
$ 440,000,000 |
| Jun 10, 2013 |
|
$ 1,150,000,000 |
| Jun 09, 2013 |
|
Undisclosed amount |
| May 29, 2013 |
|
$ 323,000,000 |
| Apr 23, 2012 |
|
$ 781,000,000 |
| Dec 23, 2009 |
|
Undisclosed amount |
| Feb 01, 2007 |
|
$ 150,000,000 |
