Leases, Total Lease Cost by Class of Underlying Asset (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Finance lease cost:
Amortization of right-of-use (ROU) assets	$ 32	$ 14	$ 58	$ 24
Interest on lease liabilities	26	14	48	25
Lease cost:
Operating lease cost	107	113	216	218
Variable lease cost	33	22	69	50
Short-term lease cost	23	24	63	47
Sublease income	(2)	(16)	(8)	(18)
Total lease cost	219	171	446	346
Pipelines, Terminals, and Tanks [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	28	12	50	20
Interest on lease liabilities	25	12	46	22
Lease cost:
Operating lease cost	42	47	84	94
Variable lease cost	17	15	33	33
Short-term lease cost	2	4	6	7
Sublease income	0	0	0	0
Total lease cost	114	90	219	176
Transportation, Marine [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	0	0	0	0
Interest on lease liabilities	0	0	0	0
Lease cost:
Operating lease cost	37	34	76	68
Variable lease cost	15	7	33	17
Short-term lease cost	14	12	36	26
Sublease income	(2)	(15)	(8)	(16)
Total lease cost	64	38	137	95
Transportation, Rail [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	0	0	0	0
Interest on lease liabilities	0	0	0	0
Lease cost:
Operating lease cost	15	13	30	24
Variable lease cost	0	0	1	0
Short-term lease cost	0	0	0	0
Sublease income	0	0	0	0
Total lease cost	15	13	31	24
Feedstock Processing Equipment [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	3	1	6	2
Interest on lease liabilities	1	1	1	1
Lease cost:
Operating lease cost	4	5	8	12
Variable lease cost	0	0	1	0
Short-term lease cost	7	8	21	14
Sublease income	0	0	0	0
Total lease cost	15	15	37	29
Energy and Gases [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	1	1	2	2
Interest on lease liabilities	0	1	1	2
Lease cost:
Operating lease cost	2	2	4	4
Variable lease cost	0	0	0	0
Short-term lease cost	0	0	0	0
Sublease income	0	0	0	0
Total lease cost	3	4	7	8
Real Estate [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	0	0	0	0
Interest on lease liabilities	0	0	0	0
Lease cost:
Operating lease cost	6	10	12	14
Variable lease cost	1	0	1	0
Short-term lease cost	0	0	0	0
Sublease income	0	(1)	0	(2)
Total lease cost	7	9	13	12
Other [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	0	0	0	0
Interest on lease liabilities	0	0	0	0
Lease cost:
Operating lease cost	1	2	2	2
Variable lease cost	0	0	0	0
Short-term lease cost	0	0	0	0
Sublease income	0	0	0	0
Total lease cost	$ 1	$ 2	$ 2	$ 2