A reconciliation of the beginning and ending balance of unrecognized tax benefits is as follows:
(dollars in millions) | ||||||||||||
2013 | 2012 | 2011 | ||||||||||
Balance at January 1, |
$ | 2,943 | $ | 3,078 | $ | 3,242 | ||||||
Additions based on tax positions related to the current year |
116 | 131 | 111 | |||||||||
Additions for tax positions of prior years |
250 | 92 | 456 | |||||||||
Reductions for tax positions of prior years |
(801 | ) | (415 | ) | (644 | ) | ||||||
Settlements |
(210 | ) | 100 | (56 | ) | |||||||
Lapses of statutes of limitations |
(168 | ) | (43 | ) | (31 | ) | ||||||
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Balance at December 31, |
$ | 2,130 | $ | 2,943 | $ | 3,078 | ||||||
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