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Equity (Deficit) Schedule of Stock by Class (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Jan. 01, 2018
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Mar. 31, 2013
Sep. 08, 2008
Jun. 04, 2008
May 22, 2008
May 19, 2008
Dec. 14, 2007
Nov. 21, 2007
Class of Stock [Line Items]                          
Senior preferred stock issued, shares 1,000,000     1,000,000                  
Senior preferred stock value $ 117,149,000,000     $ 117,149,000,000                  
Senior preferred stock, shares outstanding 1,000,000     1,000,000                  
Preferred stock, shares issued 555,374,922     555,374,922                  
Preferred stock issued, amount $ 19,130,000,000     $ 19,130,000,000                  
Preferred stock, shares outstanding 555,374,922     555,374,922                  
Preferred stock outstanding, amount $ 19,130,000,000     $ 19,130,000,000                  
Series 2008-2 Senior Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Senior preferred stock issued, shares 1,000,000     1,000,000                  
Senior preferred stock value $ 117,149,000,000     $ 117,149,000,000       $ 1,000,000,000          
Senior preferred stock, shares outstanding 1,000,000     1,000,000                  
Senior preferred stock, stated value per share $ 117,149             $ 1,000          
Series D Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 3,000,000     3,000,000                  
Preferred stock issued, amount $ 150,000,000     $ 150,000,000                  
Preferred stock, shares outstanding 3,000,000     3,000,000                  
Preferred stock outstanding, amount $ 150,000,000     $ 150,000,000                  
Preferred stock, stated value per share $ 50                        
Preferred stock, annual dividend rate (as a percent) 5.25%                        
Series E Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 3,000,000     3,000,000                  
Preferred stock issued, amount $ 150,000,000     $ 150,000,000                  
Preferred stock, shares outstanding 3,000,000     3,000,000                  
Preferred stock outstanding, amount $ 150,000,000     $ 150,000,000                  
Preferred stock, stated value per share $ 50                        
Preferred stock, annual dividend rate (as a percent) 5.10%                        
Series F Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 14,000,000     14,000,000                  
Preferred stock issued, amount $ 690,000,000     $ 690,000,000                  
Preferred stock, shares outstanding 14,000,000     14,000,000                  
Preferred stock outstanding, amount $ 690,000,000     $ 690,000,000                  
Preferred stock, stated value per share $ 50                        
Preferred stock, annual dividend rate (as a percent) 0.73%                        
Preferred Stock, Redemption Terms P2Y                        
Series G Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 6,000,000     6,000,000                  
Preferred stock issued, amount $ 288,000,000     $ 288,000,000                  
Preferred stock, shares outstanding 6,000,000     6,000,000                  
Preferred stock outstanding, amount $ 288,000,000     $ 288,000,000                  
Preferred stock, stated value per share $ 50                        
Preferred stock, annual dividend rate (as a percent) 0.61%                        
Preferred Stock, Redemption Terms P2Y                        
Series H Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 8,000,000     8,000,000                  
Preferred stock issued, amount $ 400,000,000     $ 400,000,000                  
Preferred stock, shares outstanding 8,000,000     8,000,000                  
Preferred stock outstanding, amount $ 400,000,000     $ 400,000,000                  
Preferred stock, stated value per share $ 50                        
Preferred stock, annual dividend rate (as a percent) 5.81%                        
Series I Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 6,000,000     6,000,000                  
Preferred stock issued, amount $ 300,000,000     $ 300,000,000                  
Preferred stock, shares outstanding 6,000,000     6,000,000                  
Preferred stock outstanding, amount $ 300,000,000     $ 300,000,000                  
Preferred stock, stated value per share $ 50                        
Preferred stock, annual dividend rate (as a percent) 5.375%                        
Series L Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 7,000,000     7,000,000                  
Preferred stock issued, amount $ 345,000,000     $ 345,000,000                  
Preferred stock, shares outstanding 7,000,000     7,000,000                  
Preferred stock outstanding, amount $ 345,000,000     $ 345,000,000                  
Preferred stock, stated value per share $ 50                        
Preferred stock, annual dividend rate (as a percent) 5.125%                        
Series M Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 9,000,000     9,000,000                  
Preferred stock issued, amount $ 460,000,000     $ 460,000,000                  
Preferred stock, shares outstanding 9,000,000     9,000,000                  
Preferred stock outstanding, amount $ 460,000,000     $ 460,000,000                  
Preferred stock, stated value per share $ 50                        
Preferred stock, annual dividend rate (as a percent) 4.75%                        
Series N Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 5,000,000     5,000,000                  
Preferred stock issued, amount $ 225,000,000     $ 225,000,000                  
Preferred stock, shares outstanding 5,000,000     5,000,000                  
Preferred stock outstanding, amount $ 225,000,000     $ 225,000,000                  
Preferred stock, stated value per share $ 50                        
Preferred stock, annual dividend rate (as a percent) 5.50%                        
Series O Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 50,000,000     50,000,000                  
Preferred stock issued, amount $ 2,500,000,000     $ 2,500,000,000                  
Preferred stock, shares outstanding 50,000,000     50,000,000                  
Preferred stock outstanding, amount $ 2,500,000,000     $ 2,500,000,000                  
Preferred stock, stated value per share $ 50                        
Preferred stock, annual dividend rate (as a percent) 7.00%                        
Convertible Series 2004-1 Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 24,922     24,922                  
Preferred stock issued, amount $ 2,492,000,000     $ 2,492,000,000                  
Preferred stock, shares outstanding 24,922     24,922                  
Preferred stock outstanding, amount $ 2,492,000,000     $ 2,492,000,000                  
Preferred stock, stated value per share $ 100,000                        
Preferred stock, annual dividend rate (as a percent) 5.375%                        
Series P Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 40,000,000     40,000,000                  
Preferred stock issued, amount $ 1,000,000,000     $ 1,000,000,000                  
Preferred stock, shares outstanding 40,000,000     40,000,000                  
Preferred stock outstanding, amount $ 1,000,000,000     $ 1,000,000,000                  
Preferred stock, stated value per share $ 25                        
Preferred stock, annual dividend rate (as a percent) 4.50%                        
Series Q Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 15,000,000     15,000,000                  
Preferred stock issued, amount $ 375,000,000     $ 375,000,000                  
Preferred stock, shares outstanding 15,000,000     15,000,000                  
Preferred stock outstanding, amount $ 375,000,000     $ 375,000,000                  
Preferred stock, stated value per share $ 25                        
Preferred stock, annual dividend rate (as a percent) 6.75%                        
Series R Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 21,000,000     21,000,000               1,200,000 20,000,000
Preferred stock issued, amount $ 530,000,000     $ 530,000,000               $ 30,000,000 $ 500,000,000
Preferred stock, shares outstanding 21,000,000     21,000,000                  
Preferred stock outstanding, amount $ 530,000,000     $ 530,000,000                  
Preferred stock, stated value per share $ 25                        
Preferred stock, annual dividend rate (as a percent) 7.625%                        
Series S Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 280,000,000     280,000,000                  
Preferred stock issued, amount $ 7,000,000,000     $ 7,000,000,000                  
Preferred stock, shares outstanding 280,000,000     280,000,000                  
Preferred stock outstanding, amount $ 7,000,000,000     $ 7,000,000,000                  
Preferred stock, stated value per share $ 25                        
Preferred stock, annual dividend rate (as a percent) 7.75%                        
Preferred Stock, Redemption Terms P5Y                        
Series T Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, shares issued 89,000,000     89,000,000         1,000,000 8,000,000 80,000,000    
Preferred stock issued, amount $ 2,225,000,000     $ 2,225,000,000         $ 25,000,000 $ 200,000,000 $ 2,000,000,000    
Preferred stock, shares outstanding 89,000,000     89,000,000                  
Preferred stock outstanding, amount $ 2,225,000,000     $ 2,225,000,000                  
Preferred stock, stated value per share $ 25                        
Preferred stock, annual dividend rate (as a percent) 8.25%                        
Maximum [Member] | Series F Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, annual dividend rate (as a percent) 11.00%                        
Maximum [Member] | Series G Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, annual dividend rate (as a percent) 11.00%                        
Minimum [Member] | Series O Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, annual dividend rate (as a percent) 7.00%                        
Minimum [Member] | Series P Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, annual dividend rate (as a percent) 4.50%                        
Minimum [Member] | Series S Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, annual dividend rate (as a percent) 7.75%                        
Two-year Constant Maturity U.S. Treasury Rate [Member] | Series F Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock dividend rate, basis spread on variable rate 0.16%                        
Two-year Constant Maturity U.S. Treasury Rate [Member] | Series G Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock dividend rate, basis spread on variable rate 0.18%                        
Ten-year Constant Maturity U.S. Treasury Rate [Member] | Series O Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock dividend rate, basis spread on variable rate 2.375%                        
Three-Month LIBOR [Member] | Series P Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock dividend rate, basis spread on variable rate 0.75%                        
Three-Month LIBOR [Member] | Series S Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock dividend rate, basis spread on variable rate 4.23%                        
US Treasury [Member]                          
Class of Stock [Line Items]                          
Capital reserve amount for the fiscal year based on the amended Senior Preferred Stock Purchase agreement $ 600,000,000 $ 0 $ 600,000,000 1,200,000,000   $ 3,000,000,000              
Reduction in Dividends Paid 2,400,000,000                        
Annual Reduction of Capital Reserve Amount from 2013 to 2017, Senior Preferred Stock Purchase Agreement, Amendment $ 600,000,000     $ 600,000,000 $ 600,000,000   $ 600,000,000            
US Treasury [Member] | Scenario, Forecast [Member]                          
Class of Stock [Line Items]                          
Capital Reserve Amount, Fiscal Year, Senior Preferred Stock Purchase Agreement, December 2017 Amendment   $ 3,000,000,000