uncertain tax positions the following is a reconciliation of the company 2019s beginning and ending amount of uncertain tax positions ( in millions ) : .

2018
2017
balance at january 1
$ 280
$ 278
additions based on tax positions related to the current year
18
25
additions for tax positions of prior years
10
12
reductions for tax positions of prior years
-24 ( 24 )
-26 ( 26 )
settlements
2014
-6 ( 6 )
business combinations
1
2014
lapse of statute of limitations
-6 ( 6 )
-7 ( 7 )
foreign currency translation
2014
4
balance at december 31
$ 279
$ 280

the company 2019s liability for uncertain tax positions as of december 31 , 2018 , 2017 , and 2016 , includes $ 228 million , $ 219 million , and $ 240 million , respectively , related to amounts that would impact the effective tax rate if recognized .
it is possible that the amount of unrecognized tax benefits may change in the next twelve months ; however , the company does not expect the change to have a significant impact on its consolidated statements of income or consolidated balance sheets .
these changes may be the result of settlements of ongoing audits .
at this time , an estimate of the range of the reasonably possible outcomes within the twelve months cannot be made .
the company recognizes interest and penalties related to uncertain tax positions in its provision for income taxes .
the company accrued potential interest and penalties of $ 22 million , $ 11 million , and $ 15 million in 2018 , 2017 , and 2016 , respectively .
the company recorded a liability for interest and penalties of $ 77 million , $ 55 million , and $ 48 million as of december 31 , 2018 , 2017 , and 2016 , respectively .
the company and its subsidiaries file income tax returns in their respective jurisdictions .
the company has substantially concluded all u.s .
federal income tax matters for years through 2007 .
material u.s .
state and local income tax jurisdiction examinations have been concluded for years through 2005 .
the company has concluded income tax examinations in its primary non-u.s .
jurisdictions through 2010 .
12 .
shareholders 2019 equityq y distributable reserves as a company incorporated in england and wales , aon is required under u.k .
law to have available 201cdistributable reserves 201d to make share repurchases or pay dividends to shareholders .
distributable reserves may be created through the earnings of the u.k .
parent company and , among other methods , through a reduction in share capital approved by the courts of england and wales .
distributable reserves are not directly linked to a u.s .
gaap reported amount ( e.g. , retained earnings ) .
as of december 31 , 2018 and 2017 , the company had distributable reserves in excess of $ 2.2 billion and $ 1.2 billion , respectively .
ordinary shares aon has a share repurchase program authorized by the company 2019s board of directors ( the 201crepurchase program 201d ) .
the repurchase program was established in april 2012 with $ 5.0 billion in authorized repurchases , and was increased by $ 5.0 billion in authorized repurchases in each of november 2014 and february 2017 for a total of $ 15.0 billion in repurchase authorizations .
under the repurchase program , class a ordinary shares may be repurchased through the open market or in privately negotiated transactions , from time to time , based on prevailing market conditions , and will be funded from available capital. .

Question: what is the decrease observed in the additions for tax positions of prior years , in millions?
Answer: 2
Explanation: it is the difference between those values .
Calculation: subtract(12, 10)