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Related Party Transactions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
RELATED PARTY ASSETS      
Accounts receivable $ 41 $ 38  
Other current assets 6 0  
Deferred charges and other assets 109 86  
Total Assets 156 124  
RELATED PARTY LIABILITIES      
Current portion of debt 6 6  
Accounts payable 25 23  
Other current liabilities 4 3  
Long-term debt 154 157  
Other long-term liabilities and deferred credits 48 41  
Total Liabilities 237 230  
RELATED PARTY REVENUES      
Revenues 11,700 13,209 $ 14,144
RELATED PARTY OPERATING COSTS, EXPENSES AND OTHER      
Cost of Sales 2,545 3,263 4,421
Other operating expenses (2) (3) (3)
Affiliated Entity [Member]      
RELATED PARTY REVENUES      
Revenues 206 269 265
RELATED PARTY OPERATING COSTS, EXPENSES AND OTHER      
Cost of Sales 116 75 63
Other operating expenses $ 119 $ 132 $ 91