CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Loans held-for-sale, at fair value	$ 405	$ 14
Loans held for investment, at fair value	$ 16	$ 0
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	26,250	1,000
Common stock, par value (in dollars per share)	$ 0.625	$ 0.625
Common stock, shares authorized (in shares)	700,000,000	400,000,000
Common stock, shares issued (in shares)	555,030,652	311,469,056