| Date | Acquired | Amount |
|---|---|---|
| Jan 09, 2017 |
|
Undisclosed amount |
| Oct 31, 2016 |
|
$ 34,000,000,000 |
| Jun 14, 2016 |
|
$ 20,000,000 |
| Mar 30, 2016 |
|
Undisclosed amount |
| Apr 22, 2015 |
|
Undisclosed amount |
| Dec 11, 2014 |
|
Undisclosed amount |
| Dec 08, 2014 |
|
Undisclosed amount |
| Nov 19, 2013 |
|
$ 200,000,000 |
| Jun 13, 2013 |
|
Undisclosed amount |
| Apr 28, 2011 |
|
$ 2,500,000,000 |
| Apr 01, 2011 |
|
$ 12,200,000,000 |
