| Date | Acquired | Amount |
|---|---|---|
| Nov 06, 2017 |
|
$ 1,150,000,000 |
| Feb 23, 2017 |
|
Undisclosed amount |
| Sep 15, 2016 |
|
$ 354,000,000 |
| Sep 14, 2016 |
|
Undisclosed amount |
| Jul 01, 2015 |
|
$ 715,000,000 |
| Jul 14, 2004 |
|
Undisclosed amount |
| Mar 15, 2004 |
|
$ 1,500,000,000 |
| Nov 14, 2003 |
|
$ 340,000,000 |
