Share-Based Compensation Plans Share options activity (Details) (Share options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share options [Member]
Share Options (in shares)
Beginning outstanding	3,462	5,611
Granted	0	0
Exercised	(416)	(610)
Forfeited and expired	(2)	(10)
Outstanding at end of period	3,044	4,991
Exercisable at end of period	2,928	4,579
Weighted-Average Exercise Price (in dollars per share)
Beginning outstanding	$ 32	$ 32
Granted	$ 0	$ 0
Exercised	$ 33	$ 31
Forfeited and expired	$ 36	$ 33
Outstanding at end of period	$ 32	$ 32
Exercisable at end of period	$ 32	$ 32