CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Current Assets
Cash and cash equivalents	$ 2,308	$ 7,369	$ 5,924
Accounts receivable (net of allowance of $9 million and $7 million)
Customers	1,025us-gaap_AccountsReceivableNetCurrent	1,118us-gaap_AccountsReceivableNetCurrent
Others	1,149us-gaap_NontradeReceivablesCurrent	1,409us-gaap_NontradeReceivablesCurrent
Other current assets	683us-gaap_OtherAssetsCurrent	1,325us-gaap_OtherAssetsCurrent
Total	5,165us-gaap_AssetsCurrent	11,221us-gaap_AssetsCurrent
Properties and Equipment
Cost	76,040us-gaap_PropertyPlantAndEquipmentGross	75,107us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation, depletion, and amortization	37,770	33,518
Net properties and equipment	38,270us-gaap_PropertyPlantAndEquipmentNet	41,589us-gaap_PropertyPlantAndEquipmentNet
Other Assets	2,998us-gaap_OtherAssetsNoncurrent	2,310us-gaap_OtherAssetsNoncurrent
Goodwill and Other Intangible Assets	6,540	6,569
Total Assets	52,973us-gaap_Assets	61,689us-gaap_Assets
Current Liabilities
Accounts payable	3,252us-gaap_AccountsPayableCurrent	3,683us-gaap_AccountsPayableCurrent
Current asset retirement obligations	282	257
Accrued expenses	1,100us-gaap_AccruedLiabilitiesCurrent	994us-gaap_AccruedLiabilitiesCurrent
Short-term debt	500us-gaap_DebtCurrent	0us-gaap_DebtCurrent
Total	5,228us-gaap_LiabilitiesCurrent	10,234us-gaap_LiabilitiesCurrent
Long-term Debt	16,365	15,092
Other Long-term Liabilities
Deferred income taxes	7,521	9,249
Asset retirement obligations	1,803	1,796
Other	3,122us-gaap_OtherLiabilitiesNoncurrent	3,000us-gaap_OtherLiabilitiesNoncurrent
Total	12,446	14,045
Stockholders' equity
Common stock, par value $0.10 per share (1.0 billion shares authorized, 527.6 million and 525.9 million shares issued)	52us-gaap_CommonStockValue	52us-gaap_CommonStockValue
Paid-in capital	9,045	9,005
Retained earnings	8,718	12,125
Treasury stock (19.7 million and 19.3 million shares)	(976)us-gaap_TreasuryStockValue	(940)us-gaap_TreasuryStockValue
Accumulated other comprehensive income (loss)	(507)	(517)
Total Stockholders’ Equity	16,332us-gaap_StockholdersEquity	19,725us-gaap_StockholdersEquity
Noncontrolling interests	2,602us-gaap_MinorityInterest	2,593us-gaap_MinorityInterest
Total Equity	18,934	22,318
Total Liabilities and Equity	52,973	61,689
Pending Litigation [Member] \| Deepwater Horizon [Member]
Current Liabilities
Litigation-related contingent liability	94	90
Judicial Ruling [Member] \| Tronox Litigation [Member]
Current Liabilities
Litigation-related contingent liability	$ 0	$ 5,210	$ 5,150

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 4.E)

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-Number Topic 4

-Section E

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29-31)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568447-111683

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-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568740-111683

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4I

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4590271-111686

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 50

-Paragraph 4

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