XML 84 R73.htm IDEA: XBRL DOCUMENT v3.20.2
Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Related Party Transactions [Abstract]        
Operating revenues and other income $ 353 $ 796 $ 887 $ 1,479
Purchases 1,130 3,260 3,256 5,928
Operating expenses and selling, general and administrative expenses $ 55 $ 8 $ 106 $ 17