Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
HTM securities, Fair Value		$ 20,047
LHFS at fair value		988
MSRs at fair value	$ 2,618	1,108
Other Assets, Fair Value Disclosure	3,310	1,015
Other Liabilities, Fair Value Disclosure	$ 1,440	$ 392
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