Debt - Components of Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 6,806	$ 6,592
Less: Current maturities of long-term debt	112	86
Total long-term debt	6,694	6,506
Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	5,874	5,593
Financing obligations associated with floating production system	192	264
Fair value adjustments - interest rate hedging	7	31
Total debt	6,073	5,888
Bakken Midstream
Debt Instrument [Line Items]
Total debt	733	704
Bakken Midstream - term loan A facility	580	594
Revolving credit facility - Outstanding amount	153	110
1.3% Due 2017 \| Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	0	299
8.1% Due 2019 \| Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	349	996
3.5% Due 2024 \| Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	297	296
4.3% due 2027 \| Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	989	0
7.9% Due 2029 \| Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	499	693
7.3% Due 2031 \| Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	679	744
7.1% Due 2033 \| Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	596	595
6.0% Due 2040 \| Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	740	739
5.6% Due 2041 \| Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	1,232	1,231
5.8% due 2047 \| Debt Excluding Bakken Midstream
Debt Instrument [Line Items]
Fixed-rate public notes	$ 493	$ 0

Fair value adjustments interest rate hedging.

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- Definition

The noncurrent amount of debt outstanding for the leased floating production system at Tubular Bells Project as of the balance sheet date.

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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