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Debt - Bank Credit Facilities Table (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Line of Credit Facility [Line Items]  
Number Of Credit Facilities 2
Corporate Revolving Bank Credit Facility [Member]
 
Line of Credit Facility [Line Items]  
Facility structure Senior secured revolving
Maturity date December 2015
Borrowing capacity $ 4,000
Amount outstanding as of June 30, 2014 0
Letters of credit outstanding as of June 30, 2014 20
Oilfield Services Revolving Bank Credit Facility [Member]
 
Line of Credit Facility [Line Items]  
Facility structure Senior secured revolving
Maturity date November 2016
Borrowing capacity 500
Amount outstanding as of June 30, 2014 0
Letters of credit outstanding as of June 30, 2014 $ 0