| Date | Acquired | Amount |
|---|---|---|
| Jan 18, 2017 |
|
$ 960,000,000 |
| Apr 22, 2014 |
|
Undisclosed amount |
| Feb 24, 2014 |
|
Undisclosed amount |
| Jan 24, 2012 |
|
Undisclosed amount |
| Nov 08, 2010 |
|
$ 800,000,000 |
| Jul 02, 2010 |
|
$ 280,000,000 |
| Oct 06, 2008 |
|
$ 6,500,000,000 |
| Jul 08, 2008 |
|
$ 64,000,000 |
| May 25, 2007 |
|
Undisclosed amount |
| Apr 03, 2007 |
|
Undisclosed amount |
| Jan 29, 2007 |
|
Undisclosed amount |
| Nov 22, 2003 |
|
$ 400,000,000 |
| Feb 01, 1992 |
|
Undisclosed amount |
| Sep 19, 1985 |
|
$ 300,000,000 |
