Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Proceeds			$ 146		$ 114
Asset Retirement Obligations Associated with Assets Sold			43		10
Gain on Divestitures	44	(4)	42		12
US Onshore Assets Sold [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Proceeds	18		110
Net Book Value of Assets Sold	(11)		(118)
Goodwill Allocated to Assets Sold	0		(6)
Asset Retirement Obligations Associated with Assets Sold	0		20
Gain on Divestitures	7		6
China Assets Sold [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Proceeds			36
Noncash Consideration Received			150
Consideration Received			186	[1]
Net Book Value of Assets Sold			149
Other Closing Adjustments			2
Gain on Divestitures			$ 35

[1] (1) Proceeds included $36 million cash received prior to June 30, 2014 and $150 million cash received on July 2, 2014, which was recorded as accounts receivable at June 30, 2014.