CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Restricted commercial mortgage loans related to securitization entities	$ 53	$ 62
Class A common stock, par value	$ 0.001	$ 0.001
Class A common stock, shares authorized	1,500,000,000	1,500,000,000
Class A common stock, shares issued	592,000,000	589,000,000
Class A common stock, shares outstanding	504,000,000	501,000,000
Treasury stock, shares	88,000,000	88,000,000