Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current Assets
Cash and Cash Equivalents	$ 1,117	$ 1,387
Accounts Receivable, Net	947	964
Other Current Assets	547	420
Total Current Assets	2,611	2,771
Property, Plant and Equipment
Oil and Gas Properties (Successful Efforts Method of Accounting)	22,243	19,496
Property, Plant and Equipment, Other	517	344
Total Property, Plant and Equipment, Gross	22,760	19,840
Accumulated Depreciation, Depletion and Amortization	(7,035)	(6,289)
Total Property, Plant and Equipment, Net	15,725	13,551
Goodwill	627	635
Other Noncurrent Assets	679	597
Total Assets	19,642	17,554
Current Liabilities
Accounts Payable - Trade	1,354	1,508
Other Current Liabilities	988	1,024
Total Current Liabilities	2,342	2,532
Long-Term Debt	4,566	3,736
Deferred Income Taxes, Noncurrent	2,441	2,218
Other Noncurrent Liabilities	1,109	810
Total Liabilities	10,458	9,296
Commitments and Contingencies
Shareholders Equity [Abstract]
Preferred Stock - Par Value $1.00 per share; 4 Million Shares Authorized, None Issued	0	0
Common Stock - Par Value $0.01; 500 Million Shares Authorized; 400 Million and 397 Million Shares Issued, Respectively	4	4
Additional Paid in Capital	3,463	3,302
Accumulated Other Comprehensive Loss	(117)	(113)
Treasury Stock, at Cost; 38 Million Shares	(659)	(648)
Retained Earnings	6,493	5,713
Total Shareholders’ Equity	9,184	8,258
Total Liabilities and Shareholders’ Equity	$ 19,642	$ 17,554