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Capital Stock (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-based compensation expensed:
Allocated Share-based Compensation Expense	$ 113	$ 164	$ 104
Restricted stock, capitalized	42	71	46
Total	155	235	150
General and Administrative Expense [Member]
Stock-based compensation expensed:
Allocated Share-based Compensation Expense	69	98	67
Lease Operating Expenses [Member]
Stock-based compensation expensed:
Allocated Share-based Compensation Expense	$ 44	$ 66	$ 37

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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