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Equity Equity - Dividends (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2016
USD ($)
5.75% Cumulative Convertible Preferred Stock [Member]  
Dividends Payable [Line Items]  
Preferred Stock, Amount of Preferred Dividends in Arrears $ 63
5.75% Cumulative Convertible Preferred Stock Series A [Member]  
Dividends Payable [Line Items]  
Preferred Stock, Amount of Preferred Dividends in Arrears 48
4.50% Cumulative Convertible Preferred Stock [Member]  
Dividends Payable [Line Items]  
Preferred Stock, Amount of Preferred Dividends in Arrears 7
5.0% Cumulative Convertible Preferred Stock Series 2005 B [Member]  
Dividends Payable [Line Items]  
Preferred Stock, Amount of Preferred Dividends in Arrears $ 9