Consolidated Balance Sheet (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 245	$ 295
Receivables, net of allowance	3,163	3,079
Inventories	607	655
Drilling advances	368	229
Derivative instruments	284	304
Prepaid assets and other	287	241
Total current assets	4,954	4,803
Oil and gas, on the basis of full-cost accounting:
Proved properties	69,438	67,805
Unproved properties and properties under development, not being amortized	5,731	5,530
Gathering, transmission and processing facilities	5,438	5,175
Other	733	709
Total property and equipment, gross	81,340	79,219
Less: Accumulated depreciation, depletion and amortization	(35,511)	(33,771)
Total property and equipment, net	45,829	45,448
OTHER ASSETS:
Goodwill	1,114	1,114
Deferred charges and other	1,340	686
Total Assets	53,237	52,051
CURRENT LIABILITIES:
Accounts payable	1,059	1,048
Current debt	429	431
Current asset retirement obligation	448	447
Derivative instruments	150	113
Other current liabilities	2,612	2,924
Total current liabilities	4,698	4,963
LONG-TERM DEBT	7,444	6,785
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES:
Income taxes	7,217	7,197
Asset retirement obligation	3,482	3,440
Other	681	673
Total deferred credits other noncurrent liabilities	11,380	11,310
COMMITMENTS AND CONTINGENCIES (Note 8)
SHAREHOLDERS' EQUITY:
Preferred stock, no par value, 10,000,000 shares authorized, 6% Cumulative Mandatory Convertible, Series D, $1,000 per share liquidation preference, 1,265,000 shares issued and outstanding	1,227	1,227
Common stock, $0.625 par, 860,000,000 shares authorized, 385,587,864 and 385,249,885 shares issued, respectively	241	241
Paid-in capital	9,107	9,066
Retained earnings	19,213	18,500
Treasury stock, at cost, 1,103,196 and 1,132,242 shares, respectively	(31)	(32)
Accumulated other comprehensive loss	(42)	(9)
Total shareholders' equity	29,715	28,993
Total liabilities and shareholders' equity	$ 53,237	$ 52,051