Leases, Total Lease Cost by Class of Underlying Asset (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Finance lease cost:
Amortization of ROU assets	$ 14	$ 38
Interest on lease liabilities	13	38
Lease cost:
Operating lease cost	114	332
Variable lease cost	26	76
Short-term lease cost	22	69
Sublease income	(9)	(27)
Total lease cost	180	526
Pipelines, Terminals, and Tanks [Member]
Finance lease cost:
Amortization of ROU assets	12	32
Interest on lease liabilities	13	35
Lease cost:
Operating lease cost	46	140
Variable lease cost	20	53
Short-term lease cost	1	8
Sublease income	0	0
Total lease cost	92	268
Transportation, Marine [Member]
Finance lease cost:
Amortization of ROU assets	0	0
Interest on lease liabilities	0	0
Lease cost:
Operating lease cost	39	107
Variable lease cost	4	21
Short-term lease cost	13	39
Sublease income	(8)	(24)
Total lease cost	48	143
Transportation, Rail [Member]
Finance lease cost:
Amortization of ROU assets	0	0
Interest on lease liabilities	0	0
Lease cost:
Operating lease cost	14	38
Variable lease cost	0	0
Short-term lease cost	0	0
Sublease income	0	0
Total lease cost	14	38
Feedstock Processing Equipment [Member]
Finance lease cost:
Amortization of ROU assets	2	4
Interest on lease liabilities	0	1
Lease cost:
Operating lease cost	4	16
Variable lease cost	1	1
Short-term lease cost	8	22
Sublease income	0	0
Total lease cost	15	44
Energy and Gases [Member]
Finance lease cost:
Amortization of ROU assets	0	2
Interest on lease liabilities	0	2
Lease cost:
Operating lease cost	3	7
Variable lease cost	0	0
Short-term lease cost	0	0
Sublease income	0	0
Total lease cost	3	11
Real Estate [Member]
Finance lease cost:
Amortization of ROU assets	0	0
Interest on lease liabilities	0	0
Lease cost:
Operating lease cost	7	21
Variable lease cost	1	1
Short-term lease cost	0	0
Sublease income	(1)	(3)
Total lease cost	7	19
Other [Member]
Finance lease cost:
Amortization of ROU assets	0	0
Interest on lease liabilities	0	0
Lease cost:
Operating lease cost	1	3
Variable lease cost	0	0
Short-term lease cost	0	0
Sublease income	0	0
Total lease cost	$ 1	$ 3