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Acquisitions Acquisition of HST, WHC & MPLXT - Cash Flow (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]            
Net (loss) income $ 191 $ 72 [1] $ 378 $ 58 [1]    
Adjustments to reconcile net income (loss) to cash provided by operating activities            
Amortization of deferred financing costs     25 23    
Depreciation and amortization 164 151 351 287    
Impairment expense 0 1 0 130    
Deferred income taxes     1 (13)    
Asset retirement expenditures     (1) (2)    
(Income) loss from equity method investments 1 (83) 6 [2] (78) [2]    
Distributions from unconsolidated affiliates     66 78    
Changes in:            
Current receivables     17 (20)    
Inventories     (2) (3)    
Fair value of derivatives     22 (25)    
Current accounts payable and accrued liabilities     (16) 19    
Receivables from / liabilities to related parties     22 (12)    
All other, net     32 22    
Net cash provided by operating activities     844 670 [3]    
Additions to property, plant and equipment (372) (302) (652) (606)    
Investments - net related party loans     80 37    
Investments in unconsolidated affiliates     640 39    
All other, net     1 5    
Net cash used in investing activities     (1,404) (603) [3]    
Long-term debt - borrowings     2,241 434    
Long-term debt - repayments     (1) (1,311)    
Related party debt - borrowings     12 1,853    
Related party debt - repayments     12 1,861    
Net proceeds from equity offerings     443 321    
Issuance of redeemable preferred units     0 984    
Distributions to unitholders and general partner     (505) (391)    
Distributions to noncontrolling interests     (2) (1)    
Contributions from noncontrolling interests     128 2    
All other, net     (7) (1)    
Net cash provided by (used in) financing activities     619 (75)    
Net increase (decrease) in cash and cash equivalents     59 (8)    
Cash and cash equivalents $ 293 35 293 35 $ 234 $ 43
Scenario, Previously Reported [Member]            
Business Acquisition [Line Items]            
Net (loss) income   20   (17)    
Adjustments to reconcile net income (loss) to cash provided by operating activities            
Amortization of deferred financing costs       23    
Depreciation and amortization   137   269    
Impairment expense   1   130    
Deferred income taxes       (13)    
Asset retirement expenditures       (2)    
(Income) loss from equity method investments   (83)   (78)    
Distributions from unconsolidated affiliates       78    
Changes in:            
Current receivables       (20)    
Inventories       (3)    
Fair value of derivatives       (25)    
Current accounts payable and accrued liabilities       18    
Receivables from / liabilities to related parties       6    
All other, net       21    
Net cash provided by operating activities       593    
Additions to property, plant and equipment       (569)    
Investments - net related party loans       77    
Investments in unconsolidated affiliates       39    
All other, net       5    
Net cash used in investing activities       (526)    
Long-term debt - borrowings       434    
Long-term debt - repayments       (1,311)    
Related party debt - borrowings       1,853    
Related party debt - repayments       1,861    
Net proceeds from equity offerings       321    
Issuance of redeemable preferred units       984    
Distributions to unitholders and general partner       (391)    
Distributions to noncontrolling interests       (1)    
Contributions from noncontrolling interests       2    
All other, net       (1)    
Net cash provided by (used in) financing activities       (75)    
Net increase (decrease) in cash and cash equivalents       (8)    
Cash and cash equivalents   35   35   43
Scenario, Adjustment [Member]            
Business Acquisition [Line Items]            
Net (loss) income   0   0    
Adjustments to reconcile net income (loss) to cash provided by operating activities            
Depreciation and amortization   0   0    
Impairment expense   0   0    
(Income) loss from equity method investments   0   0    
HST & WHC [Member] | Scenario, Adjustment [Member]            
Business Acquisition [Line Items]            
Net (loss) income   16   39    
Adjustments to reconcile net income (loss) to cash provided by operating activities            
Amortization of deferred financing costs       0    
Depreciation and amortization   4   8    
Impairment expense   0   0    
Deferred income taxes       0    
Asset retirement expenditures       0    
(Income) loss from equity method investments   0   0    
Distributions from unconsolidated affiliates       0    
Changes in:            
Current receivables       0    
Inventories       0    
Fair value of derivatives       0    
Current accounts payable and accrued liabilities       (1)    
Receivables from / liabilities to related parties       0    
All other, net       3    
Net cash provided by operating activities       49    
Additions to property, plant and equipment       (23)    
Investments - net related party loans       (26)    
Investments in unconsolidated affiliates       0    
All other, net       0    
Net cash used in investing activities       (49)    
Long-term debt - borrowings       0    
Long-term debt - repayments       0    
Related party debt - borrowings       0    
Related party debt - repayments       0    
Net proceeds from equity offerings       0    
Issuance of redeemable preferred units       0    
Distributions to unitholders and general partner       0    
Distributions to noncontrolling interests       0    
Contributions from noncontrolling interests       0    
All other, net       0    
Net cash provided by (used in) financing activities       0    
Net increase (decrease) in cash and cash equivalents       0    
Cash and cash equivalents   0   0   0
MPLX Terminals [Member] | Scenario, Adjustment [Member]            
Business Acquisition [Line Items]            
Net (loss) income   36   36    
Adjustments to reconcile net income (loss) to cash provided by operating activities            
Amortization of deferred financing costs       0    
Depreciation and amortization   10   10    
Impairment expense   0   0    
Deferred income taxes       0    
Asset retirement expenditures       0    
(Income) loss from equity method investments   0   0    
Distributions from unconsolidated affiliates       0    
Changes in:            
Current receivables       0    
Inventories       0    
Fair value of derivatives       0    
Current accounts payable and accrued liabilities       2    
Receivables from / liabilities to related parties       (18)    
All other, net       (2)    
Net cash provided by operating activities       28    
Additions to property, plant and equipment       (14)    
Investments - net related party loans       (14)    
Investments in unconsolidated affiliates       0    
All other, net       0    
Net cash used in investing activities       (28)    
Long-term debt - borrowings       0    
Long-term debt - repayments       0    
Related party debt - borrowings       0    
Related party debt - repayments       0    
Net proceeds from equity offerings       0    
Issuance of redeemable preferred units       0    
Distributions to unitholders and general partner       0    
Distributions to noncontrolling interests       0    
Contributions from noncontrolling interests       0    
All other, net       0    
Net cash provided by (used in) financing activities       0    
Net increase (decrease) in cash and cash equivalents       0    
Cash and cash equivalents   $ 0   0   $ 0
MPC            
Changes in:            
Distributions to MPC from Predecessor     (1,511) 0    
MPC | Scenario, Previously Reported [Member]            
Changes in:            
Distributions to MPC from Predecessor       (104)    
MPC | Predecessor            
Changes in:            
Distributions to MPC from Predecessor     $ (113) (104)    
MPC | HST & WHC [Member] | Scenario, Adjustment [Member]            
Changes in:            
Distributions to MPC from Predecessor       0    
MPC | MPLX Terminals [Member] | Scenario, Adjustment [Member]            
Changes in:            
Distributions to MPC from Predecessor       $ 0    
[1] Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.
[2] Income (loss) from equity method investments includes the impact of any basis differential amortization or accretion.
[3] Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.