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Subsequent Event (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2018
Jul. 31, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Subsequent Event [Line Items]              
Proceeds from issuance of common stock           $ 1,150 $ 0
Proceeds from issuance of preferred stock           495 $ 0
Common Stock              
Subsequent Event [Line Items]              
Proceeds from issuance of common stock   $ 1,150          
Charles River Development              
Subsequent Event [Line Items]              
Amount of share repurchase program suspended       $ 300 $ 350 950  
Charles River Development | Common Stock              
Subsequent Event [Line Items]              
Proceeds from issuance of common stock           1,150  
Charles River Development | Preferred Stock              
Subsequent Event [Line Items]              
Proceeds from issuance of preferred stock           $ 500  
Subsequent Event | Charles River Development              
Subsequent Event [Line Items]              
Payment for acquisition $ 2,600            
Forecast | Charles River Development              
Subsequent Event [Line Items]              
Amount of share repurchase program suspended     $ 300