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Investments In and Advances To Affiliates (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 18, 2019
Apr. 09, 2018
Sep. 30, 2019
Jul. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jul. 01, 2019
Mar. 31, 2019
Investments in and Advances to Affiliates [Line Items]                    
Gain (Loss) on Disposition of Property Plant Equipment     $ 2              
Revenue         $ 2,625 $ 2,837 $ 7,758 $ 8,114    
Operating margin         701 671 1,789 1,927    
Gain (Loss) on Disposition of Business         16 (21) 9 856    
Equity Method Investment, Realized Gain (Loss) on Disposal (less than)       $ 14            
Income (Loss) from Equity Method Investments         $ 4 $ 6 3 31    
Business Combination, Consideration Transferred       $ 53            
Equity Method Investments                 $ 99  
Minority Owned Affiliates [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Revenue             807 734    
Operating margin             87 119    
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest             (65) 36    
Simple Energy [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Payments to Acquire Businesses, Net of Cash Acquired   $ 35                
sPower [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Equity Method Investment, Ownership Percentage Sold 48.00%                  
Proceeds from Sale of Equity Method Investments $ 173                  
Reinvestment of Proceeds from Sale of Equity Method Investments             $ 58 $ 0    
Gain (Loss) on Disposition of Business $ 28                  
Equity Method Investment, Ownership Percentage 26.00%                 50.00%
Gas Natural del Este [Member]                    
Investments in and Advances to Affiliates [Line Items]                    
Noncash or Part Noncash Divestiture, Amount of Consideration Received     $ 55