CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, shares authorized	1,250,000,000	1,250,000,000
Common shares, shares issued	320,039,778	316,816,851
Treasury shares	134,646,639	124,698,544
Consolidated investment entities [Member]
Receivables, fair value (in dollars)	$ 28	$ 32
Debt, fair value (in dollars)	5,466	4,804
Other liabilities, fair value (in dollars)	$ 81	$ 193