Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Preferred Stock (Details)

v3.8.0.1
Shareholders' Equity - Preferred Stock (Details) - USD ($)
 3 Months Ended
Mar. 15, 2018
Mar. 31, 2018
Mar. 31, 2017
Class of Stock [Line Items]      
Issuance of preferred stock   $ 2,349,000,000  
Preferred stock dividends   (428,000,000) $ (502,000,000)
Retained Earnings      
Class of Stock [Line Items]      
Preferred stock dividends   (428,000,000) $ (502,000,000)
Series FF Preferred Stock [Member]      
Class of Stock [Line Items]      
Issuance of preferred stock   $ 2,350,000,000  
Shares issued (in shares) 94,000    
Per annum dividend rate   5.875%  
Preferred Stock, Liquidation Preference, Value   $ 25,000