CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
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		329,842,827	328,537,214
Treasury shares		205,903,593	192,206,467
Consolidated investment entities [Member]
Receivables, fair value (in dollars)		$ 8	$ 12
Other assets, fair value (in dollars)		0	0
Debt, fair value (in dollars)	[1]	1,628	1,743
Other liabilities, fair value (in dollars)		$ 84	$ 122

[1] The carrying value of the CLOs’ debt is set equal to the fair value of the CLOs’ assets. The estimated fair value of the CLOs’ debt was $1.7 billion as of both December 31, 2019 and 2018.