CONSOLIDATED BALANCE SHEET (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 160	$ 295
Receivables, net of allowance	3,086	3,079
Inventories	908	655
Drilling advances	584	229
Derivative instruments	31	304
Prepaid assets and other	193	241
Total current assets	4,962	4,803
Oil and gas, on the basis of full-cost accounting:
Proved properties	78,383	67,805
Unproved properties and properties under development, not being amortized	8,754	5,530
Gathering, transmission, and processing facilities	5,955	5,175
Other	1,055	709
Property plant and equipment, gross	94,147	79,219
Less: Accumulated depreciation, depletion, and amortization	(40,867)	(33,771)
Property plant and equipment, net	53,280	45,448
OTHER ASSETS:
Goodwill	1,289	1,114
Deferred charges and other	1,206	686
Total Assets	60,737	52,051
CURRENT LIABILITIES:
Accounts payable	1,092	1,048
Current debt	990	431
Current asset retirement obligation	478	447
Derivative instruments	116	113
Other current liabilities	2,860	2,924
Total current liabilities	5,536	4,963
LONG-TERM DEBT	11,355	6,785
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES:
Income taxes	8,024	7,197
Asset retirement obligation	4,100	3,440
Other	391	673
Total deferred credits other noncurrent liabilities	12,515	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, 392,712,245 and 385,249,885 shares issued, respectively	245	241
Paid-in capital	9,859	9,066
Retained earnings	20,161	18,500
Treasury stock, at cost, 1,071,475 and 1,132,242 shares, respectively	(30)	(32)
Accumulated other comprehensive loss	(131)	(9)
Total shareholders' liabilities	31,331	28,993
Total liabilities and shareholders' equity	$ 60,737	$ 52,051