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Related Party Transactions - Expenses Incurred and Payments Made to Related Parties (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]      
Cost of materials and other $ 6,185 $ 3,373 $ 4,851
Dividends 241 121 306
Enable Joint Venture Transportation Agreement | Joint Venture Transportation Agreement      
Related Party Transaction [Line Items]      
Cost of materials and other 11 11 12
IEP      
Related Party Transaction [Line Items]      
Dividends 348 85 218
AEP Tax Allocation Agreement | Tax Allocation Agreement      
Related Party Transaction [Line Items]      
Payments (received) made: $ 0 $ 0 $ (3)