Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Restricted Cash and Cash Equivalents	$ 17,920,000,000	$ 991,000,000
Mortgages Held-for-sale, Fair Value Disclosure	13,518,000,000	15,035,000,000
Allowance for loan losses	6,121,000,000	4,234,000,000
Other Assets, Fair Value Disclosure	4,914,000,000	4,627,000,000
Debt instrument recorded at fair value	3,214,000,000	3,938,000,000
Senior preferred stock, at redemption value	$ 81,770,000,000	$ 79,322,000,000
Common Stock, No Par Value	$ 0	$ 0
Common Stock, Shares Authorized	4,000,000,000	4,000,000,000
Common Stock, Shares, Issued	725,863,886	725,863,886
Common Stock, Shares, Outstanding	650,059,033	650,059,033
Treasury Stock, Shares	75,804,853	75,804,853