Related Party Transactions Related Party A/R and A/P (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019
Notes Receivable, Related Parties			$ 75
Total accounts receivable from related companies	$ 138	$ 175
Accounts Payable, Related Parties, Current	1,037	1,112
ET
Total accounts receivable from related companies	7	8
Accounts Payable, Related Parties, Current	1,029	1,085
Trans-Pecos Pipeline, LLC
Total accounts receivable from related companies	20	50
Phillips 66 Company [Member]
Total accounts receivable from related companies	11	36
Other
Total accounts receivable from related companies	46	39
Accounts Payable, Related Parties, Current	8	27
Traverse [Member]
Total accounts receivable from related companies	54	42
ET-ETO Promissory Note B [Member] | ET
Notes Receivable, Related Parties	$ 3,230	$ 3,710