Leases Leases Narrative (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	[2]	Dec. 31, 2019
Lessor, Sales-type Lease, Assumptions and Judgments, Value of Underlying Asset, Amount		$ 171
Sales-type Lease, Lease Receivable		370
Sales-type Lease, Selling Profit (Loss)		209
MPC
Operating Lease, Lease Income	[1]	186	$ 279
Sales-type Lease, Lease Receivable		425
Sales-type Lease, Unguaranteed Residual Asset		19			$ 7
Refining Logistics [Member] | MPC
Sales-type Lease, Unguaranteed Residual Asset		$ 10

[1] These amounts are presented net of executory costs.

[2] Financial information for the first quarter of 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.