Other Property and Equipment Other Property and Equipment - Other Properties Table (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Oilfield services equipment	$ 2,192	$ 2,130
Property and equipment, other	5,395	5,908
Accumulated Depreciation And Amortization Of Other Property And Equipment	(1,584)	(1,293)
Total Other Property And Equipment, Net	3,811	4,615
Oilfield Services Equipment [Member]
Property, Plant and Equipment [Line Items]
Oilfield services equipment	2,192	2,130
Property, Plant and Equipment, Estimated Useful Lives	3 - 15
Building and Improvements [Member]
Property, Plant and Equipment [Line Items]
Buildings and Improvements, Gross	1,433	1,580
Property, Plant and Equipment, Estimated Useful Lives	10 - 39
Natural Gas Compressors [Member]
Property, Plant and Equipment [Line Items]
Machinery and Equipment, Gross	368	505
Property, Plant and Equipment, Estimated Useful Lives	3 - 20
Land [Member]
Property, Plant and Equipment [Line Items]
Land	212	515
Property, Plant and Equipment, Estimated Useful Lives	0
Property, Plant and Equipment, Other Types
Property, Plant and Equipment [Line Items]
Property and Equipment Other Miscellaneous	$ 1,190	$ 1,178
Property, Plant and Equipment, Estimated Useful Lives	2 - 20