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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating activities:    
Net income $ 378 $ 58 [1]
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of deferred financing costs 25 23
Depreciation and amortization 351 287
Impairment expense 0 130
Deferred income taxes 1 (13)
Asset retirement expenditures 1 2
(Gain) loss on disposal of assets 1 0
(Income) loss from equity method investments [2] 6 (78)
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]
Investing activities:    
Additions to property, plant and equipment (652) (606)
Acquisitions, net of cash acquired (220) 0
Disposal of assets 3 0
Investments - net related party loans 80 37
Investments in unconsolidated affiliates 640 39
Distributions from unconsolidated affiliates - return of capital 24 0
All other, net 1 5
Net cash used in investing activities (1,404) (603) [3]
Financing activities:    
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
Debt issuance costs 21 0
Net proceeds from equity offerings 443 321
Issuance of redeemable preferred units 0 984
Distributions to preferred unitholders (33) 0
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 at beginning of period 234 43
Cash and cash equivalents at end of period 293 35
MPC    
Financing activities:    
Distributions to MPC from Predecessor (1,511) 0
Predecessor | MPC    
Financing activities:    
Distributions to MPC from Predecessor $ (113) $ (104)
[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.