CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 2,697	$ 3,680
Accounts receivable, net of allowance:
Customers	1,269	1,032
Others	1,990	1,391
Other current assets	975	572
Total	6,931	6,675
Properties and Equipment
Cost	60,081	54,815
Less accumulated depreciation, depletion, and amortization	22,580	16,858
Net properties and equipment	37,501	37,957
Other Assets	1,516	1,616
Goodwill and Other Intangible Assets	5,831	5,311
Total Assets	51,779	51,559
Current Liabilities
Accounts payable	3,299	2,726
Accrued expenses	1,430	1,097
Current portion of long-term debt	170	291
Total	4,899	4,114
Long-term Debt	15,060	12,722
Other Long-term Liabilities
Deferred income taxes	8,479	9,861
Asset retirement obligations	1,737	1,529
Other	2,621	1,894
Total	12,837	13,284
Stockholders' equity
Common stock, par value $0.10 per share (1.0 billion shares authorized, 516.0 million and 513.3 million shares issued as of December 31, 2011 and 2010, respectively)	51	51
Paid-in capital	7,851	7,496
Retained earnings	11,619	14,449
Treasury stock (17.6 million and 17.1 million shares as of December 31, 2011 and 2010, respectively)	(804)	(763)
Accumulated other comprehensive income (loss)	(612)	(549)
Total Stockholders' Equity	18,105	20,684
Noncontrolling interests	878	755
Total Equity	18,983	21,439
Total Liabilities and Equity	$ 51,779	$ 51,559