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Common Stock (Equity Securities Offering) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 20, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Forward Contract Indexed to Issuer's Equity [Line Items]        
Maximum value of shares to be issued under ATM program $ 1,000      
Proceeds from the issuance of common stock       $ 834
Forward contract indexed to issuer's equity, shares       1.1
Stock issued during period, shares, DRIP       1.7
Stock issued during period, value, DRIP       $ 134
ATM [Member]        
Forward Contract Indexed to Issuer's Equity [Line Items]        
Settlement alternative, shares       2.6
ATM [Member] | Wells Fargo Bank [Member]        
Forward Contract Indexed to Issuer's Equity [Line Items]        
Shares offered   1.3    
Forward contract indexed to issuer's equity, forward rate per share   $ 72.02    
ATM [Member] | Citibank [Member]        
Forward Contract Indexed to Issuer's Equity [Line Items]        
Shares offered   1.3    
Forward contract indexed to issuer's equity, forward rate per share   $ 78.71    
Equity Forwards [Member]        
Forward Contract Indexed to Issuer's Equity [Line Items]        
Shares offered     21.3  
Forward contract indexed to issuer's equity, forward rate per share     $ 74.07  
Sales price     $ 75  
Settlement alternative, shares     21.3  
Shares, Issued   10.6    
Proceeds from the issuance of common stock   $ 781