Debt - Components of Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Credit facility
Fixed-rate public notes	$ 5,625	$ 5,625
Total debt	6,630	5,987
Debt related to Bakken Midstream:
Less: Current maturities of long-term debt	86	68
Total long-term debt	6,544	5,919
Debt Excluding Bakken Midstream
Credit facility
Fixed-rate public notes	5,625	5,625
Financing obligations associated with floating production system	264	331
Fair value adjustments - interest rate hedging	31	31
Total debt	5,920	5,987
Bakken Midstream
Credit facility
Total debt	710	0
Debt related to Bakken Midstream:
Bakken Midstream - term loan A facility	600	0
Revolving credit facility - Outstanding amount	110	0
1.3% Due 2017 \| Debt Excluding Bakken Midstream
Credit facility
Fixed-rate public notes	300	300
8.1% Due 2019 \| Debt Excluding Bakken Midstream
Credit facility
Fixed-rate public notes	999	999
3.5% Due 2024 \| Debt Excluding Bakken Midstream
Credit facility
Fixed-rate public notes	298	298
7.9% Due 2029 \| Debt Excluding Bakken Midstream
Credit facility
Fixed-rate public notes	696	696
7.3% Due 2031 \| Debt Excluding Bakken Midstream
Credit facility
Fixed-rate public notes	747	747
7.1% Due 2033 \| Debt Excluding Bakken Midstream
Credit facility
Fixed-rate public notes	598	598
6.0% Due 2040 \| Debt Excluding Bakken Midstream
Credit facility
Fixed-rate public notes	745	745
5.6% Due 2041 \| Debt Excluding Bakken Midstream
Credit facility
Fixed-rate public notes	$ 1,242	$ 1,242

Debt excluding bakken midstream.

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- Definition

Debt related to bakken midstream.

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- Definition

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 of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.22)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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

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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.

+ References

Reference 1: 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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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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 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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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
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-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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

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