Summary of Significant Accounting Policies Senior Preferred Stock Purchase Agreement (Details) - USD ($)		12 Months Ended
	Sep. 08, 2008	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2013	Sep. 07, 2008
Related Parties [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%	35.00%	35.00%
Early Lender Funding Advances, Maximum Term		60 days
Weighted Average Number of Shares, Contingently Issuable		4,600,000,000	4,600,000,000	4,600,000,000
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock			131,000,000	131,000,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 14,608,000,000	$ 6,240,000,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent		13,969,000,000	15,611,000,000	$ 2,257,000,000
US Treasury [Member]
Related Parties [Line Items]
Capital Reserve Amount, Fiscal Year, Senior Preferred Stock Purchase Agreement, Amendment			$ 3,000,000,000.0				$ 25,000,000,000	$ 3,000,000,000	$ 0	$ 0
Capital Reserve Amount Fiscal Year Senior Preferred Stock Purchase Agreement September 2019 Amendment							$ 22,000,000,000
Aggregate liquidation preference of senior preferred stock		$ 131,200,000,000
Percentage Of Common Shares Attributable to Warrants Issued to Treasury as Percentage to Total Diluted Common Shares		79.90%
Common stock warrant exercise price per share											$ 0.00001
Fair value of the warrant at issuance	$ 3,500,000,000
Forecast [Member] | US Treasury [Member]
Related Parties [Line Items]
Aggregate liquidation preference of senior preferred stock						$ 135,400,000,000
Series 2008-2 Senior Preferred Stock [Member]
Related Parties [Line Items]
Stock Issued During Period, Shares, New Issues	1,000,000
Aggregate liquidation preference of senior preferred stock	$ 1,000,000,000.0