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 9 Months Ended
Jul. 24, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Class of Stock [Line Items]            
Preferred stock dividends         $ 1,212,000,000 $ 1,292,000,000
Issuance of preferred stock         4,515,000,000  
Series HH Preferred Stock            
Class of Stock [Line Items]            
Shares issued (in shares) 34,160          
Per annum dividend rate 5.875%          
Issuance of preferred stock $ 844,000,000          
Liquidation preference $ 25,000          
Series D, Series I, Series K and Series 3 Preferred Stock            
Class of Stock [Line Items]            
Repurchase of redeemable preferred stock   $ 1,700,000,000        
Retained Earnings            
Class of Stock [Line Items]            
Preferred stock dividends   $ 466,000,000 $ 318,000,000 $ 428,000,000 $ 1,212,000,000 $ 1,292,000,000