Basis of Presentation (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Production Expense
Lease Operating Expense	$ 154		$ 140		$ 299		$ 257
Production and Ad Valorem Taxes	53		43		102		86
Transportation and Gathering Expense	41		27		80		55
Total	248		210		481		398
Other Non-Operating (Income) Expense, Net
Deferred Compensation Expense	8	[1]	3	[1]	12	[1]	14	[1]
Other Expense, Net	0		0		1		(2)
Total	8		3		13		12
Accounts Receivable, Net
Proceeds Receivable from China Asset Sale	150	[2]			150	[2]			0	[2]
Commodity Sales	464				464				495
Joint Interest Billings	310				310				382
Other	91				91				81
Allowance for Doubtful Accounts	(11)				(11)				(11)
Total	1,004				1,004				947
Other Current Assets
Inventories, Materials and Supplies	94				94				96
Inventories, Crude Oil	23				23				25
Deferred Income Taxes, Net	63				63				62
Assets Held-for-Sale	74				74				292
Prepaid Expenses and Other Current Assets	58				58				72
Total	312				312				547
Other Noncurrent Assets
Equity Method Investments	484				484				437
Mutual Fund Investments	121				121				114
Commodity Derivative Assets	2				2				16
Other Assets	97				97				112
Total	704				704				679
Other Current Liabilities
Production and Ad Valorem Taxes	111				111				103
Commodity Derivative Liabilities	199				199				65
Income Taxes Payable	77				77				156
Asset Retirement Obligations	141				141				39
Interest Payable	61				61				63
Current Portion of Long Term Debt	0	[3]			0	[3]			200	[3]
Current Portion of Capital Lease	59	[3]			59	[3]			58	[3]
Liabilities Associated with Assets Held for Sale	14				14				111
Other	204				204				193
Total	866				866				988
Other Noncurrent Liabilities
Deferred Compensation Liabilities	276				276				253
Asset Retirement Obligations	563				563				547
Accrued Benefit Costs	108				108				155
Commodity Derivative Liabilities	89				89				10
Other	107				107				144
Total	$ 1,143				$ 1,143				$ 1,109

[1] Amounts represent increases in the fair value of shares of our common stock held in a rabbi trust.

[2] The sale was completed on June 30, 2014; bank transfer of the proceeds was completed on July 2, 2014.

[3] See Note 6. Debt.