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Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Beginning balance at Dec. 31, 2015	$ 19,675	$ 7	$ (7,275)	$ 11,071	$ 9,752	$ (318)	$ 6,438
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(78)				1		(79)
Dividends declared	(169)				(169)
Distributions to noncontrolling interests	(121)						(121)
Contributions from noncontrolling interests	2						2
Other comprehensive income (loss)	0
Shares repurchased	(75)		(75)
Shares returned - stock based compensation			(3)
Shares issued - stock based compensation				1
Net shares issued - stock based compensation	(2)
Stock-based compensation	17			15			2
Impact from equity transactions of MPLX LP	250			(105)			355
Other	(5)						(5)
Ending balance at Mar. 31, 2016	19,494	7	(7,353)	10,982	9,584	(318)	6,592
Beginning balance at Dec. 31, 2016	20,203	7	(7,482)	11,060	10,206	(234)	6,646
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	85				30		55
Dividends declared	(190)				(190)
Distributions to noncontrolling interests	(142)						(142)
Contributions from noncontrolling interests	126						126
Other comprehensive income (loss)	(3)					(3)
Shares repurchased	(420)		(420)
Shares returned - stock based compensation			(3)
Shares issued - stock based compensation				10
Net shares issued - stock based compensation	7
Stock-based compensation	17			17			0
Impact from equity transactions of MPLX LP	114			72			42
Ending balance at Mar. 31, 2017	$ 19,797	$ 7	$ (7,905)	$ 11,159	$ 10,046	$ (237)	$ 6,727

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