Share repurchase programs (Tables)

9 Months Ended

Sep. 30, 2015

Share repurchase programs [Abstract]

Schedule of outstanding share repurchase programs

In billions
Authorization Date	Authorized			Remaining
December 15, 2014 (“2014 Repurchase Program”)		$	10.0		$	8.8
December 17, 2013 (“2013 Repurchase Program”)		$	6.0		—
					$	8.8