| Date | Acquired | Amount |
|---|---|---|
| Mar 13, 2017 |
|
$ 490,000,000 |
| Nov 01, 2013 |
|
$ 1,100,000,000 |
| Oct 09, 2012 |
|
Undisclosed amount |
| Apr 01, 2004 |
|
$ 16,000,000,000 |
| Nov 30, 1995 |
|
$ 4,000,000,000 |
