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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating activities:      
Net income $ 2,133 $ 3,393 $ 2,389
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 1,220 995 891
Pension and other postretirement benefits, net (124) 153 (90)
Deferred income taxes 23 492 123
Net gain on disposal of assets (6) (177) (12)
Equity method investments, net (18) 11 (2)
Changes in the fair value of derivative instruments (21) 59 (57)
Changes in:      
Current receivables (940) 851 (1,177)
Inventories (305) (115) (255)
Current accounts payable and accrued liabilities 1,464 (1,223) 1,502
All other, net (21) 53 (3)
Net cash provided by operating activities 3,405 4,492 3,309
Investing activities:      
Additions to property, plant and equipment (1,206) (1,369) (1,185)
Acquisitions (1,515) (190) (74)
Disposal of assets 16 53 144
Investments in related party debt securities – purchases 0 0 (10,326)
Investments in related party debt securities – redemptions 0 0 12,730
Investments—acquisition, loans and contributions (151) (57) (56)
Investments—redemptions and repayments 77 108 53
All other, net 23 3 9
Net cash provided by (used in) investing activities (2,756) (1,452) 1,295
Financing activities:      
Long-term debt payable to Marathon Oil and subsidiaries – borrowings 0 0 7,748
Long-term debt payable to Marathon Oil and subsidiaries – repayments 0 0 (11,366)
Long-term debt – borrowings 0 0 2,989
Long-term debt – repayments (21) (17) (12)
Debt issuance costs (4) (6) (60)
Issuance of common stock 48 108 1
Common stock repurchased (2,793) (1,350) 0
Dividends paid (484) (407) (160)
Net proceeds from issuance of MPLX LP common units 0 407 0
Distributions to noncontrolling interests (21) 0 0
Distributions to Marathon Oil Corporation 0 0 (783)
Tax settlement with Marathon Oil Corporation 39 0 0
All other, net 19 6 0
Net cash used in financing activities (3,217) (1,259) (1,643)
Net increase (decrease) in cash and cash equivalents (2,568) 1,781 2,961
Cash and cash equivalents at beginning of period 4,860 3,079 118
Cash and cash equivalents at end of period $ 2,292 $ 4,860 $ 3,079