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Acquisitions and Divestitures (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Acquisitions and Divestitures [Line Items]      
Equity Method Investment, Ownership Percentage     50.10%
Equity Method Investment, Net Sales Proceeds   $ 1,000  
Equity Method Investment, Realized Gain (Loss) on Disposal   777  
Proceeds Received Prior Year [Member]      
Acquisitions and Divestitures [Line Items]      
Equity Method Investment, Net Sales Proceeds   530  
Proceeds Received Current Year [Member]      
Acquisitions and Divestitures [Line Items]      
Equity Method Investment, Net Sales Proceeds $ 501    
Proceeds To Be Received In Future Year [Member] [Member]      
Acquisitions and Divestitures [Line Items]      
Equity Method Investment, Net Sales Proceeds   $ 501