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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities:    
Net income $ 235 $ 101
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization of deferred financing costs and debt discount 18 15
Depreciation and amortization 528 536
Pension and other postretirement benefits, net 32 27
Deferred income taxes (19) (5)
Net gain on disposal of assets (2) (5)
Income from equity method investments (86) (57)
Distributions from equity method investments 89 56
Changes in the fair value of derivative instruments (14) 28
Changes in:    
Current receivables 96 333
Inventories 440 264
Current accounts payable and accrued liabilities (1,455) (215)
All other, net 1 30
Net cash provided by (used in) operating activities (137) 1,108
Investing activities:    
Additions to property, plant and equipment (755) (610)
Acquisitions, net of cash acquired 0 (220)
Disposal of assets 7 2
Investments – acquisitions, loans and contributions (41) (566)
Investments - redemptions, repayments and return of capital 0 20
All other, net 11 21
Net cash used in investing activities (778) (1,353)
Financing activities:    
Commercial paper – issued 0 300
Commercial paper - repayments 0 (300)
Long-term debt – borrowings 9,610 2,241
Long-term debt – repayments (5,264) (207)
Debt issuance costs (53) (21)
Issuance of common stock 12 10
Common stock repurchased (1,327) (420)
Dividends paid (219) (190)
Issuance of MPLX LP common units 0 148
Distributions to noncontrolling interests (195) (158)
Contributions from noncontrolling interests 1 126
All other, net (8) (6)
Net cash provided by financing activities 2,557 1,523
Net increase in cash, cash equivalents and restricted cash 1,642 1,278
Cash, cash equivalents and restricted cash at beginning of period 3,015 [1] 892
Cash, cash equivalents and restricted cash at end of period $ 4,657 [1] $ 2,170
[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.”