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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows From Operating Activities      
Net income $ 223 $ 721 $ 208
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation, depletion and amortization 2,261 2,209 2,309
Deferred income taxes 2,073 1,087 692
Amortization of excess cost of equity investments 61 59 51
Change in fair market value of derivative contracts 40 64 (166)
Loss (gain) on early extinguishment of debt 4 (45) 0
Loss on impairment of goodwill (Note 4) 0 0 1,150
Loss on impairments and divestitures, net (Note 4) 13 387 919
Loss on impairments and divestitures of equity investments, net (Note 4) 150 610 30
Earnings from equity investments (578) (497) (414)
Distributions of equity investment earnings 426 431 391
Pension contributions and noncash pension benefit expenses (credits) 8 9 (90)
Changes in components of working capital, net of the effects of acquisitions and dispositions      
Accounts receivable, net (78) (107) 382
Income tax receivable 7 (148) 195
Inventories (90) 49 34
Other current assets (25) (81) 113
Accounts payable 73 144 (154)
Accrued interest, net of interest rate swaps 10 (18) 37
Accrued contingencies and other current liabilities 101 79 (121)
Rate reparations, refunds and other litigation reserve adjustments (100) (32) 18
Other, net 22 (126) (271)
Net Cash Provided by Operating Activities 4,601 4,795 5,313
Cash Flows From Investing Activities      
Acquisitions of assets and investments, net of cash acquired (4) (333) (2,079)
Capital expenditures (3,188) (2,882) (3,896)
Proceeds from sale of equity interests in subsidiaries, net 0 1,401 0
Sales of property, plant and equipment, investments, and other net assets, net of removal costs 118 330 39
Contributions to investments (684) (408) (96)
Distributions from equity investments in excess of cumulative earnings 374 231 228
Other, net 22 (44) 98
Net Cash Used in Investing Activities (3,362) (1,705) (5,706)
Cash Flows From Financing Activities      
Issuances of debt 8,868 8,629 14,316
Payments of debt (11,064) (10,060) (15,116)
Debt issue costs (70) (19) (24)
Issuances of common shares (Note 11) 0 0 3,870
Issuance of mandatory convertible preferred stock (Note 11) 0 0 1,541
Cash dividends - common shares (Note 11) (1,120) (1,118) (4,224)
Cash dividends - preferred shares (Note 11) (156) (154) 0
Repurchases of shares and warrants (Note 11) (250) 0 (12)
Contributions from investment partner 485 0 0
Contributions from noncontrolling interests - net proceeds from KML IPO (Note 3) 1,245 0 0
Contributions from noncontrolling interests - net proceeds from KML preferred share issuances (Note 11) 420 0 0
Contributions from noncontrolling interests - other 12 117 11
Distributions to noncontrolling interests (42) (24) (34)
Other, net (9) (8) (11)
Net Cash (Used in) Provided by Financing Activities (1,681) (2,637) 317
Effect of Exchange Rate Changes on Cash and Cash Equivalents 22 2 (10)
Net (decrease) increase in Cash and Cash Equivalents (420) 455 (86)
Cash and Cash Equivalents, beginning of period 684 229 315
Cash and Cash Equivalents, end of period 264 684 229
Noncash Investing and Financing Activities      
Assets acquired by the assumption or incurrence of liabilities 0 43 1,681
Net assets contributed to equity investments 0 37 46
Increase in property, plant and equipment from both accruals and contractor retainage 14    
Supplemental Disclosures of Cash Flow Information      
Cash paid during the period for interest (net of capitalized interest) 1,854 2,050 1,985
Cash (refunded) paid during the period for income taxes, net $ (140) $ 4 $ (331)