| Date | Acquired | Amount |
|---|---|---|
| Jun 04, 2015 |
|
Undisclosed amount |
| Sep 22, 2011 |
|
$ 10,000,000,000 |
| Nov 11, 2010 |
|
Undisclosed amount |
| Jul 19, 2005 |
|
$ 7,800,000,000 |
| Jan 01, 1947 |
|
Undisclosed amount |
