(in millions) | 2013 | 2012 | 2011 | |||||||||
Gross unrecognized tax benefits, beginning of period | $ | 81 | $ | 129 | $ | 220 | ||||||
Gross increases: | ||||||||||||
Current year tax positions | 8 | 6 | 11 | |||||||||
Prior year tax positions | 5 | 18 | 10 | |||||||||
Gross decreases: | ||||||||||||
Prior year tax positions | — | (48 | ) | (34 | ) | |||||||
Settlements | — | (10 | ) | (25 | ) | |||||||
Statute of limitations lapses | (5 | ) | (14 | ) | (53 | ) | ||||||
Gross unrecognized tax benefits, end of period | $ | 89 | $ | 81 | $ | 129 |