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Capital Stock - Description of Stock Based Compensation Plans and Related Costs (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-based compensation expensed:
Allocated Share-based Compensation Expense	$ 167	$ 113	$ 164
Restricted stock, capitalized	67	42	71
Total	234	155	235
General and Administrative Expense [Member]
Stock-based compensation expensed:
Allocated Share-based Compensation Expense	104	69	98
Lease Operating Expenses [Member]
Stock-based compensation expensed:
Allocated Share-based Compensation Expense	$ 63	$ 44	$ 66

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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