Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Amortized cost of fixed maturity securities available-for-sale	$ 64,079	$ 60,920
Mortgage loans valuation allowances	$ 64	$ 57
Brighthouse Financial, Inc.’s stockholders’ equity:
Preferred stock, par value per share	$ 0.01	$ 0.01
Preferred Stock, Liquidation Preference, Value	$ 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	120,647,871	120,448,018
Common stock, shares outstanding	106,027,301	117,532,336	119,773,106	100,000
Treasury stock, shares outstanding	14,620,570	2,915,682