CAPITAL STOCK - Schedule of Restricted Stock Activities (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Total fair value of restricted stock awards vested	$ 103	$ 111	$ 135
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, Beginning Balance, Shares (in shares)	3,153,000	4,920,000	6,062,000
Granted, Shares (in shares)	1,479,000	608,000	1,948,000
Vested, Shares (in shares)	(1,899,000)	(2,023,000)	(2,288,000)
Forfeited, Shares (in shares)	(285,000)	(352,000)	(802,000)
Nonvested, Ending Balance, Shares (in shares)	2,448,000	3,153,000	4,920,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Non-vested Beginning Balance, Weighted Average Grant Date Fair Value (in USD per share)	$ 55.54	$ 56.67	$ 55.11
Granted, Weighted Average Grant-Date Fair Value (in USD per share)	36.81	45.59	62.74
Vested, Weighted Average Grant-Date Fair Value (in USD per share)	53.99	55.10	58.77
Forfeited, Weighted Average Grant-Date Fair Value (in USD per share)	45.06	56.69	55.54
Non-vested Ending Balance, Weighted Average Grant Date Fair Value (in USD per share)	$ 46.65	$ 55.54	$ 56.67
Total compensation cost related to non-vested awards not yet recognized	$ 18
Unvested restricted stock units (in shares)	2,447,910
Weighted-average remaining life of unvested restricted stock units	8 months 12 days
Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, Beginning Balance, Shares (in shares)	1,818,000	59,000
Granted, Shares (in shares)	4,831,000	1,973,000
Vested, Shares (in shares)	(616,000)	(38,000)
Forfeited, Shares (in shares)	(649,000)	(176,000)
Nonvested, Ending Balance, Shares (in shares)	5,384,000	1,818,000	59,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Total compensation cost related to non-vested awards not yet recognized	$ 52
Per Market Share Price of Apache Common Stock \| Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Shares (in shares)	3,401,477
Per Market Share Price of ALTM's Stock \| Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted, Shares (in shares)	1,429,135

Weighted-average remaining life of unvested restricted stock units.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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