Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets
Amortized cost of fixed maturity securities available-for-sale	$ 68,061	$ 64,079
Fixed maturity securities, allowance for credit losses	4	0
Mortgage loans valuation allowances	90	64
Leveraged leases, allowance for credit losses	$ 13	$ 0
Brighthouse Financial, Inc.’s stockholders’ equity:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, aggregate liquidation preference	$ 828	$ 425
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	120,970,368	120,647,871
Common stock, shares outstanding	91,158,927	106,027,301
Treasury stock, shares	29,811,441	14,620,570