Original sales price before closing adjustments related to the sale of a disposal group.

No definition available.

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- Definition

Amount classified as assets attributable to disposal group held for sale or disposed of.

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- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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- Definition

Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

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- Definition

Amount classified as liabilities attributable to disposal group held for sale or disposed of.

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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- Definition

Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities.

+ References

No definition available.

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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

No definition available.

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Acquisitions, Divestitures, and Assets Held for Sale (Detail) - USD ($) $ in Millions		1 Months Ended		3 Months Ended		9 Months Ended
	Nov. 25, 2014	Jul. 31, 2015	Apr. 30, 2015	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Property, Plant, and Equipment [Line Items]
Proceeds from divestitures						$ 1,248	$ 4,770
(Gains) losses on divestitures, net						$ 1,003	$ (2,194)
Held-for-sale [Member]
Property, Plant, and Equipment [Line Items]
Assets associated with assets held for sale
Liabilities associated with assets held for sale
Oil and Gas Exploration and Production Reporting Segment [Member] \| Assets Disposed of by Sale [Member] \| Certain Coalbed Methane Assets in the Rockies [Member]
Property, Plant, and Equipment [Line Items]
Proceeds from divestitures					$ 107
(Gains) losses on divestitures, net					440
Oil and Gas Exploration and Production Reporting Segment [Member] \| Assets Disposed of by Sale [Member] \| Certain Enhanced Oil Recovery Assets in the Rockies [Member]
Property, Plant, and Equipment [Line Items]
Proceeds from divestitures			$ 686
(Gains) losses on divestitures, net						$ 344
Original sales price			$ 703
Oil and Gas Exploration and Production Reporting Segment and Midstream Reporting Segment [Member] \| Assets Disposed of by Sale [Member] \| Certain U.S. Onshore East Texas Assets [Member]
Property, Plant, and Equipment [Line Items]
Proceeds from divestitures		$ 426
(Gains) losses on divestitures, net						$ 110
Original sales price		$ 440
Midstream Reporting Segment [Member] \| Held-for-sale [Member] \| Certain Coalbed Methane Assets in the Rockies [Member] \| Subsequent Event [Member]
Property, Plant, and Equipment [Line Items]
Original sales price				$ 80
Midstream Reporting Segment [Member] \| Held-for-sale [Member] \| Certain Coalbed Methane Assets in the Rockies [Member] \| Nonrecurring [Member] \| Market Approach Valuation Technique [Member] \| Fair Value, Inputs, Level 2 [Member]
Property, Plant, and Equipment [Line Items]
Loss on assets held for sale					$ 100
Gathering and Processing Assets in the Delaware Basin [Member]
Property, Plant, and Equipment [Line Items]
Purchase price	$ 1,554
Changes to the fair value of assets acquired and liabilities assumed