| Date | Acquired | Amount |
|---|---|---|
| Mar 28, 2017 |
|
Undisclosed amount |
| Dec 22, 2016 |
|
Undisclosed amount |
| Jul 14, 2016 |
|
$ 2,700,000,000 |
| Jun 21, 2016 |
|
$ 8,600,000,000 |
| Feb 18, 2015 |
|
Undisclosed amount |
| Jan 27, 2015 |
|
Undisclosed amount |
| Jan 26, 2014 |
|
Undisclosed amount |
| Mar 01, 2012 |
|
Undisclosed amount |
| Feb 01, 2011 |
|
$ 400,000,000 |
| Aug 23, 2010 |
|
Undisclosed amount |
| Apr 20, 2010 |
|
Undisclosed amount |
