Summary of Significant Accounting Policies (Details) - USD ($) shares in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020	Dec. 31, 2019
Related Parties [Line Items]
Other assets	$ 14,959,000,000			$ 14,959,000,000		$ 14,542,000,000	$ 14,312,000,000
Deferred Tax Assets, Net						12,213,000,000	11,910,000,000
Loans held for sale, at lower of cost or fair value	8,312,000,000			8,312,000,000		6,823,000,000	6,773,000,000
Allowance for Loan and Lease Losses, Real Estate	11,703,000,000			11,703,000,000		10,738,000,000	9,016,000,000
Accumulated deficit	(112,680,000,000)			(112,680,000,000)		(119,915,000,000)	$ (118,776,000,000)
Interest and Fee Income, Loans and Leases	$ 25,810,000,000		$ 29,072,000,000	$ 81,755,000,000	$ 88,445,000,000
Convertible Preferred Stock, Shares Issued upon Conversion	26,000		131,000	26,000	131,000
Provision for Loan and Lease Losses				$ 569,000,000
Net income	$ 4,229,000,000	$ 2,500,000,000	$ 3,963,000,000	7,235,000,000	$ 9,795,000,000
Aggregate liquidation preference of senior preferred stock	138,000,000,000.0			138,000,000,000.0
Non Accrual Loans [Member]
Related Parties [Line Items]
Interest and Fee Income, Loans and Leases	$ 763,000,000			$ 2,200,000,000
Accounting Standards Update 2016-13 [Member]
Related Parties [Line Items]
Other assets						230,000,000
Deferred Tax Assets, Net						303,000,000
Loans held for sale, at lower of cost or fair value						50,000,000
Allowance for Loan and Lease Losses, Real Estate						1,722,000,000
Accumulated deficit						$ (1,139,000,000)