Acquisitions and Divestitures - Additional Information - 2013 Activity - Canada LNG Project (Detail) - Kitimat LNG [Member]	Feb. 28, 2013 USD ($) a
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of ownership	50.00%
Proceeds from transaction	$ 396,000,000
Horn River and Liard Basins [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business properties held | a	644,000
Chevron Canada and Apache Canada [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from limited partnership	$ 0