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Related-Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2021
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
Related party transactions with affiliates for the three and nine months ended September 30, 2021 and 2020 were as follows (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Motor fuel sales to affiliates$7 $4 $16 $53 
Bulk fuel purchases from affiliates$461 $222 $1,213 $661