Note 21 Provisions



FOR THE YEAR ENDED DECEMBER 31	NOTE	Asset retirement obligations (AROs)		Other ⁽¹⁾		Total
January 1, 2017		175		137		312
Additions		14		46		60
Usage		(2	)	(30	)	(32	)
Reversals		(18	)	(12	)	(30	)
Acquired through business combinations		1		17		18
December 31, 2017		170		158		328
Current	18	11		44		55
Non-current	23	159		114		273
December 31, 2017		170		158		328

(1)Other includes environmental, legal, regulatory and vacant space provisions.

AROs reflect management’s best estimates of expected future costs to restore current leased premises to their original condition prior to lease inception. Cash outflows associated with our ARO liabilities are generally expected to occur at the restoration dates of the assets to which they relate, which are long-term in nature. The timing and extent of restoration work that will be ultimately required for these sites is uncertain.