| Date | Acquired | Amount |
|---|---|---|
| Jul 03, 2015 |
|
$ 37,000,000,000 |
| Nov 03, 2014 |
|
$ 400,000,000 |
| Nov 01, 2013 |
|
Undisclosed amount |
| Mar 07, 2013 |
|
$ 7,300,000,000 |
| Dec 16, 2011 |
|
Undisclosed amount |
| Jul 18, 2011 |
|
$ 202,000,000 |
| Apr 28, 2011 |
|
Undisclosed amount |
| Jan 24, 2011 |
|
$ 500,000,000 |
| Sep 07, 2007 |
|
Undisclosed amount |
| May 29, 2007 |
|
$ 535,000,000 |
| May 27, 2005 |
|
Undisclosed amount |
| Dec 10, 1998 |
|
$ 1,000,000,000 |
| Mar 23, 1998 |
|
$ 1,050,000,000 |
| Apr 02, 1996 |
|
$ 8,800,000,000 |
