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Subsequent Events (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 15, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 01, 2020
Mar. 19, 2020
Subsequent Event [Line Items]              
Impairment of equity-method investments     $ 186 $ 32 $ 0    
Income (Loss) from Equity Method Investments     375 396 $ 434    
Williams Companies Inc [Member]              
Subsequent Event [Line Items]              
Credit facility loans     $ 0 $ 160      
5.25% Senior Unsecured Notes Due 2020 [Member] | Williams Companies Inc [Member]              
Subsequent Event [Line Items]              
Long-term debt interest rate     5.25%        
Subsequent Event [Member]              
Subsequent Event [Line Items]              
Impairment of equity-method investments   $ 938          
Goodwill, Impairment Loss   187          
Subsequent Event [Member] | Rocky Mountain Midstream Holdings LLC [Member]              
Subsequent Event [Line Items]              
Income (Loss) from Equity Method Investments   (78)          
Subsequent Event [Member] | Series C Preferred Stock [Member]              
Subsequent Event [Line Items]              
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right             0.001
Preferred Stock, Par or Stated Value Per Share             $ 1.00
Subsequent Event [Member] | Dividend Declared [Member] | Series C Preferred Stock [Member]              
Subsequent Event [Line Items]              
Class of Warrant or Right, Outstanding             1
Subsequent Event [Member] | Williams Companies Inc [Member]              
Subsequent Event [Line Items]              
Credit facility loans           $ 1,700  
Subsequent Event [Member] | 5.25% Senior Unsecured Notes Due 2020 [Member] | Williams Companies Inc [Member]              
Subsequent Event [Line Items]              
Long-term debt retired $ 1,500            
Long-term debt interest rate 5.25%            
Noncontrolling Interests [Member] | Subsequent Event [Member]              
Subsequent Event [Line Items]              
Goodwill, Impairment Loss   $ 65