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PREFERRED STOCK - Schedule of Preferred Stock Outstanding (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 10, 2020
Jan. 23, 2020
Sep. 12, 2019
Apr. 25, 2016
Feb. 02, 2016
Nov. 13, 2015
Aug. 12, 2015
Apr. 24, 2015
Mar. 20, 2015
Apr. 30, 2014
Oct. 31, 2013
Sep. 19, 2013
Apr. 30, 2013
Dec. 13, 2012
Oct. 29, 2012
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Class of Stock [Line Items]                                  
Carrying value                               $ 19,480 $ 17,980
Series A                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               5.95% 5.95%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000 $ 1,000
Number of depositary shares (in shares) | shares                               1,500,000 1,500,000
Carrying value                               $ 1,500 $ 1,500
Depositary shares, interest in corresponding series of preferred stock                             0.04    
Series B                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               5.90% 5.90%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000 $ 1,000
Number of depositary shares (in shares) | shares                               750,000 750,000
Carrying value                               $ 750 $ 750
Depositary shares, interest in corresponding series of preferred stock                           0.04      
Series D                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               5.35% 5.35%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000 $ 1,000
Number of depositary shares (in shares) | shares                               1,250,000 1,250,000
Carrying value                               $ 1,250 $ 1,250
Depositary shares, interest in corresponding series of preferred stock                         0.04        
Series J                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               7.125% 7.125%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 25 $ 25
Number of depositary shares (in shares) | shares                               38,000,000 38,000,000
Carrying value                               $ 950 $ 950
Depositary shares, interest in corresponding series of preferred stock                       0.001          
Series K                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               6.875% 6.875%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 25 $ 25
Number of depositary shares (in shares) | shares                               59,800,000 59,800,000
Carrying value                               $ 1,495 $ 1,495
Depositary shares, interest in corresponding series of preferred stock                     0.001            
Series M                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               6.30% 6.30%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000 $ 1,000
Number of depositary shares (in shares) | shares                               1,750,000 1,750,000
Carrying value                               $ 1,750 $ 1,750
Depositary shares, interest in corresponding series of preferred stock                   0.04              
Series O                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                                 5.875%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                                 $ 1,000
Number of depositary shares (in shares) | shares                                 1,500,000
Carrying value                               $ 0 $ 1,500
Depositary shares, interest in corresponding series of preferred stock                 0.04                
Series P                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               5.95% 5.95%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000 $ 1,000
Number of depositary shares (in shares) | shares                               2,000,000 2,000,000
Carrying value                               $ 2,000 $ 2,000
Depositary shares, interest in corresponding series of preferred stock               0.04                  
Series Q                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               4.316% 4.316%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000 $ 1,000
Number of depositary shares (in shares) | shares                               1,250,000 1,250,000
Carrying value                               $ 1,250 $ 1,250
Depositary shares, interest in corresponding series of preferred stock             0.04                    
Series R                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               4.699% 4.699%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000 $ 1,000
Number of depositary shares (in shares) | shares                               1,500,000 1,500,000
Carrying value                               $ 1,500 $ 1,500
Depositary shares, interest in corresponding series of preferred stock           0.04                      
Series S                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               6.30% 6.30%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 25 $ 25
Number of depositary shares (in shares) | shares                               41,400,000 41,400,000
Carrying value                               $ 1,035 $ 1,035
Depositary shares, interest in corresponding series of preferred stock         0.001                        
Series T                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               6.25% 6.25%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000 $ 1,000
Number of depositary shares (in shares) | shares                               1,500,000 1,500,000
Carrying value                               $ 1,500 $ 1,500
Depositary shares, interest in corresponding series of preferred stock       0.04                          
Series U                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               5.00% 5.00%
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000 $ 1,000
Number of depositary shares (in shares) | shares                               1,500,000 1,500,000
Carrying value                               $ 1,500 $ 1,500
Depositary shares, interest in corresponding series of preferred stock     0.04                            
Series V                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               4.70%  
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000  
Number of depositary shares (in shares) | shares                               1,500,000  
Carrying value                               $ 1,500 0
Depositary shares, interest in corresponding series of preferred stock   0.04                              
Series W                                  
Class of Stock [Line Items]                                  
Dividend rate (as a percent)                               4.00%  
Redemption price per depositary share/ preference share (in dollars per share) | $ / shares                               $ 1,000  
Number of depositary shares (in shares) | shares                               1,500,000  
Carrying value                               $ 1,500 $ 0
Depositary shares, interest in corresponding series of preferred stock 0.04