Leases, Total Lease Cost by Class of Underlying Asset (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Finance lease cost:
Amortization of ROU assets	$ 54
Interest on lease liabilities	50
Lease cost:
Operating lease cost	439
Variable lease cost	103
Short-term lease cost	91
Sublease income	(30)
Total lease cost	707
Pipelines, Terminals, and Tanks [Member]
Finance lease cost:
Amortization of ROU assets	44
Interest on lease liabilities	47
Lease cost:
Operating lease cost	182
Variable lease cost	66
Short-term lease cost	9
Sublease income	0
Total lease cost	348
Transportation, Marine [Member]
Finance lease cost:
Amortization of ROU assets	0
Interest on lease liabilities	0
Lease cost:
Operating lease cost	145
Variable lease cost	35
Short-term lease cost	53
Sublease income	(27)
Total lease cost	206
Transportation, Rail [Member]
Finance lease cost:
Amortization of ROU assets	0
Interest on lease liabilities	0
Lease cost:
Operating lease cost	52
Variable lease cost	0
Short-term lease cost	0
Sublease income	0
Total lease cost	52
Feedstock Processing Equipment [Member]
Finance lease cost:
Amortization of ROU assets	7
Interest on lease liabilities	1
Lease cost:
Operating lease cost	20
Variable lease cost	1
Short-term lease cost	29
Sublease income	0
Total lease cost	58
Energy and Gases [Member]
Finance lease cost:
Amortization of ROU assets	3
Interest on lease liabilities	2
Lease cost:
Operating lease cost	9
Variable lease cost	0
Short-term lease cost	0
Sublease income	0
Total lease cost	14
Real Estate [Member]
Finance lease cost:
Amortization of ROU assets	0
Interest on lease liabilities	0
Lease cost:
Operating lease cost	27
Variable lease cost	1
Short-term lease cost	0
Sublease income	(3)
Total lease cost	25
Other [Member]
Finance lease cost:
Amortization of ROU assets	0
Interest on lease liabilities	0
Lease cost:
Operating lease cost	4
Variable lease cost	0
Short-term lease cost	0
Sublease income	0
Total lease cost	$ 4