Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Loans Held for Sale, Fair Value	$ 5,369	$ 5,673
MSRs at fair value	1,991	2,618
Other Assets, Fair Value Disclosure	4,914	3,310
Short-term borrowings, fair value	1,060	1,074
Other Liabilities, Fair Value Disclosure	$ 403	$ 366
Preferred stock, par value (in dollars per share)	$ 5	$ 5
Preferred stock, liquidation preference (in dollars per share)	25,000	25,000
Common stock, par value (in dollars per share)	$ 5	$ 5