Related Party Transactions Related Party A/R and A/P (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Total accounts receivable from related companies	$ 139	$ 167
Accounts Payable, Related Parties, Current	36	31
ET
Total accounts receivable from related companies	0	8
Accounts Payable, Related Parties, Current	21	0
Trans-Pecos Pipeline, LLC
Total accounts receivable from related companies	13	50
Phillips 66 Company [Member]
Total accounts receivable from related companies	9	36
Other
Total accounts receivable from related companies	55	31
Accounts Payable, Related Parties, Current	15	31
Traverse [Member]
Total accounts receivable from related companies	62	42
ET-ETO Promissory Note B [Member] | ET
Notes Receivable, Related Parties	$ 3,000	$ 3,700