Fair Value Measurements and Disclosures (Tables)

12 Months Ended

Dec. 31, 2015

Assets and liabilities measured at fair value on a recurring basis

Measurement information for assets and liabilities that are measured at fair value on a recurring basis was as follows:



	Fair Value Measurements Using
(millions)	Quoted Prices in Active Markets (Level 1) ⁽¹⁾			Significant Other Observable Inputs (Level 2) ⁽¹⁾			Significant Unobservable Inputs (Level 3) ⁽¹⁾		Adjustment ⁽²⁾			Fair Value Measurement
December 31, 2015
Financial Assets
Mutual Fund Investments	$	90		$	—		$	—	$	—		$	90
Commodity Derivative Instruments	—			600			—		(8		)	592
Financial Liabilities
Commodity Derivative Instruments	—			(8		)	—		8			—
Portion of Deferred Compensation Liability Measured at Fair Value	(98		)	—			—		—			(98		)
December 31, 2014
Financial Assets
Mutual Fund Investments	$	111		$	—		$	—	$	—		$	111
Commodity Derivative Instruments	—			890					—			890
Financial Liabilities
Commodity Derivative Instruments	—			—			—		—			—
Portion of Deferred Compensation Liability Measured at Fair Value	(134		)	—			—		—			(134		)


⁽¹⁾	See Note 1. Summary of Significant Accounting Policies - Fair Value Measurements for a description of the fair value hierarchy.


⁽²⁾	Amount represents the impact of netting clauses within our master agreements that allow us to net cash settle asset and liability positions with the same counterparty.

Assets and liabilities measured at fair value on a noncurring basis

Information about the impaired assets is as follows:



	Fair Value Measurements Using
Description	Quoted Prices in Active Markets (Level 1) ⁽¹⁾		Significant Other Observable Inputs (Level 2) ⁽¹⁾		Significant Unobservable Inputs (Level 3) ⁽¹⁾		Net Book Value ⁽²⁾		Total Pre-tax (Non-cash) Impairment Loss
(millions)
Year Ended December 31, 2015
Impaired Oil and Gas Properties	$	—	$	—	$	752	$	1,285	$	533
Impaired Materials and Supplies Inventory	—		—		61		81		20
Year Ended December 31, 2014
Impaired Oil and Gas Properties	—		—		100		600		500
Year Ended December 31, 2013
Impaired Oil and Gas Properties	—		—		113		199		86


⁽¹⁾	See Note 1. Summary of Significant Accounting Policies - Fair Value Measurements for a description of the fair value hierarchy.


⁽²⁾	Amount represents net book value at the date of assessment.

Additional fair value disclosures

Fair value information regarding our debt is as follows:



	December 31, 2015				December 31, 2014
(millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Long-Term Debt, Net ⁽¹⁾	$	7,626	$	7,105	$	5,758	$	6,179


⁽¹⁾	Net of unamortized discount, premium and debt issuance costs and excludes capital lease and other obligations. No floating rate debt was outstanding at December 31, 2015 or December 31, 2014.

- Definition

Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided.

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