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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 loss $ (468) $ (5,769) $ (667)
Adjustments to reconcile net loss to cash flows from operating activities:      
Depreciation, depletion and amortization 1,556 1,503 1,835
Deferred income tax provision (benefit), continuing operations 734 (1,501) (224)
Impairments and other charges 647 3,357 2,177
U.S. tax refund 478 430 0
Payment related to the Macondo well incident (368) (33) (333)
Cash impact of impairments and other charges - severance payments 0 (273) (304)
Changes in assets and liabilities:      
Receivables (1,350) 899 1,468
Accounts payable 753 (219) (603)
Inventories (29) 552 153
Other 515 (649) (596)
Total cash flows provided by (used in) operating activities 2,468 (1,703) 2,906
Cash flows from investing activities:      
Capital expenditures (1,373) (798) (2,184)
Payments to acquire businesses, net of cash acquired (628) (31) (39)
Proceeds from sales of property, plant and equipment 158 222 168
Other investing activities (84) (103) (137)
Total cash flows used in investing activities (1,927) (710) (2,192)
Cash flows from financing activities:      
Payments on long-term borrowings (1,641) (3,171) (8)
Dividends to shareholders (626) (620) (614)
Proceeds from issuance of common stock 158 186 167
Proceeds from issuance of long-term debt, net 10 74 7,440
Other financing activities (62) (9) 96
Total cash flows used in financing activities (2,161) (3,540) 7,081
Effect of exchange rate changes on cash (52) (115) (9)
Increase (decrease) in cash and equivalents (1,672) (6,068) 7,786
Cash and equivalents at beginning of year 4,009 10,077 2,291
Cash and equivalents at end of year 2,337 4,009 10,077
Cash payments (receipts) during the period for:      
Interest 594 659 380
Income taxes $ (178) $ (20) $ 370