Share-Based Compensation Plans Share options activity (Details) - Share options [Member] - $ / shares shares in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Share Options (in shares)
Beginning outstanding	2,300	3,462
Granted	0	0
Exercised	(1,388)	(839)
Forfeited and expired	(13)	(3)
Outstanding at end of period	899	2,620
Exercisable at end of period	899	2,572
Weighted-Average Exercise Price (in dollars per share)
Beginning outstanding	$ 32	$ 32
Granted	0	0
Exercised	27	32
Forfeited and expired	39	37
Outstanding at end of period	39	32
Exercisable at end of period	$ 39	$ 32