Millions of dollars | 2013 | 2012 | 2011 | |||||||||
Balance, January 1 | $ | 178 | $ | 178 | $ | 190 | ||||||
Additions for tax positions of the current year | 17 | 13 | 9 | |||||||||
Additions for tax positions of prior years | 6 | 16 | 10 | |||||||||
Reductions for tax positions of prior years | (81 | ) | (15 | ) | (24 | ) | ||||||
Settlements during the period | (3 | ) | (5 | ) | (1 | ) | ||||||
Lapses of applicable statute of limitation | (4 | ) | (9 | ) | (6 | ) | ||||||
Balance, December 31 | $ | 113 | $ | 178 | $ | 178 |