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Related Party Transactions - Expenses from Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
May 26, 2020
Mar. 09, 2020
Nov. 11, 2019
Aug. 12, 2019
May 13, 2019
Mar. 11, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]                      
Cost of materials and other             $ 846 $ 1,221 $ 2,348 $ 3,589  
Dividends $ 40 $ 80 $ 80 $ 75 $ 75 $ 75     121 225 $ 307
Enable | Joint Venture Transportation Agreement                      
Related Party Transaction [Line Items]                      
Cost of materials and other             3 3 9 8  
IEP                      
Related Party Transaction [Line Items]                      
Dividends $ 28 $ 57 $ 57 $ 53 $ 53 $ 53 $ 0 $ 53 $ 85 $ 159 $ 217