| Date | Acquired | Amount |
|---|---|---|
| Oct 30, 2017 |
|
Undisclosed amount |
| Dec 20, 2016 |
|
Undisclosed amount |
| Dec 16, 2016 |
|
Undisclosed amount |
| Nov 21, 2016 |
|
$ 665,000,000 |
| Oct 21, 2015 |
|
Undisclosed amount |
| Jun 29, 2015 |
|
$ 200,000,000 |
| Feb 18, 2014 |
|
Undisclosed amount |
| May 02, 2012 |
|
$ 1,525,000,000 |
| Jan 24, 2011 |
|
$ 470,000,000 |
| Dec 15, 2010 |
|
$ 12,900,000,000 |
| Dec 23, 2009 |
|
$ 120,000,000 |
| Oct 21, 2008 |
|
$ 115,000,000 |
| Jun 01, 2008 |
|
$ 400,000,000 |
| Nov 01, 2005 |
|
$ 5,100,000,000 |
| Feb 22, 2005 |
|
$ 8,300,000,000 |
