Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Preferred Stock (Details)

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Shareholders' Equity - Preferred Stock (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 24, 2018
May 16, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Class of Stock [Line Items]            
Preferred stock dividends         $ 746,000,000 $ 863,000,000
Issuance of preferred stock         $ 3,671,000,000  
Series GG Preferred Stock            
Class of Stock [Line Items]            
Shares issued (in shares)   54,000        
Per annum dividend rate         6.00%  
Issuance of preferred stock         $ 1,350,000,000  
Preferred stock liquidation preference     $ 25,000   25,000  
Series HH Preferred Stock | Subsequent Event            
Class of Stock [Line Items]            
Shares issued (in shares) 34,160          
Per annum dividend rate 5.875%          
Issuance of preferred stock $ 854,000,000          
Preferred stock liquidation preference $ 25,000          
Series K and Series D Preferred Stock            
Class of Stock [Line Items]            
Redeemed preferred stock     1,500,000,000      
Series M Preferred Stock            
Class of Stock [Line Items]            
Redeemed preferred stock     1,300,000,000      
Retained Earnings            
Class of Stock [Line Items]            
Preferred stock dividends     $ 318,000,000 $ 428,000,000 $ 746,000,000 $ 863,000,000