Acquisitions and Divestitures - Assets and Liabilities Held for Sale (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Assets held for sale	$ 1,231	$ 0
LIABILITIES
Liabilities held for sale	939	$ 0
Apache Canada Ltd. (ACL) [Member] \| Held for sale [Member]
ASSETS
Current assets	105
Property, plant & equipment	1,126
Assets held for sale	1,231
LIABILITIES
Current liabilities, excluding asset retirement obligation	112
Asset retirement obligation	779
Other long-term liabilities	48
Liabilities held for sale	$ 939

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