Divestitures Divestitures2 (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
Discontinued Operations, Net of Tax	0	19	0	49
North Sea Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales Proceeds				54
Oil and Gas Sales				21
Income Before Income Taxes				4
Income Tax Expense				10
Operating Loss, Net of Tax				(6)
Gain on Sale, Net of Tax				55
Discontinued Operations, Net of Tax				$ 49