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Basis of Presentation and Summary of Significant Accounting Policies Assets Held for Sale (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Long Lived Assets Held-for-sale [Line Items]    
Current assets held for sale $ 2 $ 4
Property and equipment held for sale, net 511 634
Current liabilities held for sale 18 21
Accounts Receivable [Member]
   
Long Lived Assets Held-for-sale [Line Items]    
Current assets held for sale 2 4
Natural Gas Processing Plant [Member]
   
Long Lived Assets Held-for-sale [Line Items]    
Property and equipment held for sale, net 205 352
Oilfield Services
   
Long Lived Assets Held-for-sale [Line Items]    
Property and equipment held for sale, net 1 27
Property, Plant and Equipment, Other Types
   
Long Lived Assets Held-for-sale [Line Items]    
Property and equipment held for sale, net 305 255
Accounts Payable [Member]
   
Long Lived Assets Held-for-sale [Line Items]    
Current liabilities held for sale 1 4
Accrued Liabilities [Member]
   
Long Lived Assets Held-for-sale [Line Items]    
Current liabilities held for sale $ 17 $ 17