Leases, Total Lease Cost by Class of Underlying Asset (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finance lease cost:
Amortization of right-of-use (ROU) assets	$ 34	$ 14	$ 92	$ 38
Interest on lease liabilities	26	13	74	38
Lease cost:
Operating lease cost	108	114	324	332
Variable lease cost	18	26	87	76
Short-term lease cost	19	22	82	69
Sublease income	(3)	(9)	(11)	(27)
Total lease cost	202	180	648	526
Pipelines, Terminals, and Tanks [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	29	12	79	32
Interest on lease liabilities	24	13	70	35
Lease cost:
Operating lease cost	39	46	123	140
Variable lease cost	14	20	47	53
Short-term lease cost	2	1	8	8
Sublease income	0	0	0	0
Total lease cost	108	92	327	268
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	39	39	115	107
Variable lease cost	4	4	37	21
Short-term lease cost	8	13	44	39
Sublease income	(2)	(8)	(10)	(24)
Total lease cost	49	48	186	143
Transportation, Rail [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	1	0	1	0
Interest on lease liabilities	0	0	0	0
Lease cost:
Operating lease cost	16	14	46	38
Variable lease cost	0	0	1	0
Short-term lease cost	0	0	0	0
Sublease income	0	0	0	0
Total lease cost	17	14	48	38
Feedstock Processing Equipment [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	3	2	9	4
Interest on lease liabilities	1	0	2	1
Lease cost:
Operating lease cost	4	4	12	16
Variable lease cost	0	1	1	1
Short-term lease cost	9	8	30	22
Sublease income	0	0	0	0
Total lease cost	17	15	54	44
Energy and Gases [Member]
Finance lease cost:
Amortization of right-of-use (ROU) assets	1	0	3	2
Interest on lease liabilities	1	0	2	2
Lease cost:
Operating lease cost	2	3	6	7
Variable lease cost	0	0	0	0
Short-term lease cost	0	0	0	0
Sublease income	0	0	0	0
Total lease cost	4	3	11	11
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	7	7	19	21
Variable lease cost	0	1	1	1
Short-term lease cost	0	0	0	0
Sublease income	(1)	(1)	(1)	(3)
Total lease cost	6	7	19	19
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	1	3	3
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	$ 1	$ 3	$ 3