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Financing Activities - Equity Securities (Details)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
shares
May 31, 2018
counterparties
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
shares
Feb. 28, 2018
USD ($)
Equity Programs [Line Items]          
Issuance of common stock | $     $ 678 $ 275  
Common Stock [Member]          
Equity Programs [Line Items]          
Common stock issued [1]     26,304,000 8,402,000  
Forward Sale Agreement [Member] | Common Stock [Member]          
Equity Programs [Line Items]          
Forward Contract Indexed to Issuer's Equity, Shares   55,000,000      
Number of Counterparties | counterparties   2      
Total Number Of Shares Issued In Forward Sales Agreements And Overallotment Option   63,250,000.00      
Sale of Stock, Price Per Share | $ / shares     $ 26.7057    
Common stock issued 20,000,000        
Issuance of common stock | $ $ 520        
Over-Allotment Option [Member] | Forward Sale Agreement [Member] | Common Stock [Member]          
Equity Programs [Line Items]          
Forward Contract Indexed to Issuer's Equity, Shares   8,250,000.00      
Maximum [Member] | Forward Sale Agreement [Member] | Common Stock [Member]          
Equity Programs [Line Items]          
Forward Contract Indexed to Issuer's Equity, Settlement Date   Nov. 30, 2019      
At The Market Stock Offering Program [Member]          
Equity Programs [Line Items]          
Common Stock Aggregate Sales Price | $         $ 1,000
Maximum Percentage Paid To Selling Agents     2.00%    
Common stock issued     4,200,000    
Issuance of common stock | $     $ 119    
[1] Shares in thousands. Each share entitles the holder to one vote on any question presented at any shareowners' meeting.