Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Operating activities:
Net income	$ 3,606		$ 3,804		$ 1,213
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of deferred financing costs and debt discount	70		64		61
Impairment expense	0		0		130
Depreciation and amortization	2,490		2,114		2,001
Inventory market valuation adjustment	0		0		(370)
Pension and other postretirement benefits, net	90		47		9
Deferred income taxes	47		(1,233)		394
Net gain on disposal of assets	(23)		(10)		(32)
(Income) loss from equity method investments	(373)		(306)		185
Distributions from equity method investments	519		391		317
Changes in the fair value of derivative instruments	(62)		116		(41)
Changes in operating assets and liabilities, net of effects of businesses acquired:
Current receivables	1,589		(1,093)		(674)
Inventories	931		106		(70)
Current accounts payable and accrued liabilities	(2,798)		2,814		985
All other, net	72		(202)		(91)
Net cash provided by operating activities	6,158		6,612		4,017
Investing activities:
Additions to property, plant and equipment	(3,578)		(2,732)		(2,892)
Acquisitions, net of cash acquired	(3,822)		(249)		0
Disposal of assets	54		79		101
Investments – acquisitions, loans and contributions	(409)		(805)		(288)
Investments—redemptions, repayments and return of capital	16		62		0
All other, net	69		247		112
Net cash used in investing activities	(7,670)		(3,398)		(2,967)
Financing activities:
Commercial paper – issued	0		300		1,263
Commercial paper - repayments	0		(300)		(1,263)
Long-term debt – borrowings	13,476		2,911		864
Long-term debt – repayments	(8,032)		(642)		(2,269)
Debt issuance costs	(86)		(33)		(11)
Issuance of common stock	24		46		11
Common stock repurchased	(3,287)		(2,372)		(197)
Dividends paid	(954)		(773)		(719)
Issuance of MPLX LP common units	0		473		776
Issuance of MPLX LP redeemable preferred units	0		0		984
Distributions to noncontrolling interests	(903)		(694)		(542)
Contributions from noncontrolling interests	12		129		6
Contingent consideration payment	0		(89)		(164)
All other, net	(28)		(47)		(33)
Net cash provided by (used in) financing activities	222		(1,091)		(1,294)
Net increase (decrease) in cash, cash equivalents and restricted cash	(1,290)		2,123		(244)
Cash, cash equivalents and restricted cash at beginning of period	3,015	[1]	892		1,136
Cash, cash equivalents and restricted cash at end of period	$ 1,725	[1]	$ 3,015	[1]	$ 892

[1] As a result of the adoption of ASU 2016-18, the consolidated statements of cash flows now explain the change during the period of both cash and cash equivalents and restricted cash.