CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2016		Dec. 31, 2015
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	324,006,315		322,822,746
Treasury shares	169,246,411		151,789,486
Consolidated investment entities [Member]
Receivables, fair value (in dollars)	$ 11		$ 70
Other assets, fair value (in dollars)	0		2,065
Debt, fair value (in dollars)	2,319	[1]	6,630
Other liabilities, fair value (in dollars)	$ 95		$ 221

[1] As the Company elected the measurement alternative effective January 1, 2016, the carrying value of the CLOs’ debt is set equal to the fair value of the CLOs’ assets. See Note 3 and above for additional discussion on the measurement alternative. The estimated fair value of the CLOs’ debt was $2.3 billion at December 31, 2016.