2013 | 2012 | 2011 | |||||||||||||||
Common Stock | Treasury Stock | Common Stock | Treasury Stock | Common Stock | Treasury Stock | ||||||||||||
Balance January 1 | 3,577 | 550 | 3,577 | 536 | 3,577 | 495 | |||||||||||
Purchases of treasury stock (1) | — | 139 | — | 62 | — | 58 | |||||||||||
Issuances (2) | — | (39 | ) | — | (48 | ) | — | (17 | ) | ||||||||
Balance December 31 | 3,577 | 650 | 3,577 | 550 | 3,577 | 536 | |||||||||||
(1) | Purchases of treasury stock in 2013 include 105 million shares purchased pursuant to an accelerated share repurchase agreement as discussed below. |
(2) | Issuances primarily reflect activity under share-based compensation plans. |