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Financing Receivables (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable Recorded Investment [Line Items]    
Financing receivable $ 343us-gaap_NotesReceivableNet $ 337us-gaap_NotesReceivableNet
Argentina [Member]    
Financing Receivable Recorded Investment [Line Items]    
Financing receivable 272us-gaap_NotesReceivableNet
/ us-gaap_StatementGeographicalAxis
= country_AR		 278us-gaap_NotesReceivableNet
/ us-gaap_StatementGeographicalAxis
= country_AR
CAMEROON    
Financing Receivable Recorded Investment [Line Items]    
Financing receivable 44us-gaap_NotesReceivableNet
/ us-gaap_StatementGeographicalAxis
= country_CM		 [1] 44us-gaap_NotesReceivableNet
/ us-gaap_StatementGeographicalAxis
= country_CM		 [1]
UNITED STATES    
Financing Receivable Recorded Investment [Line Items]    
Financing receivable 16us-gaap_NotesReceivableNet
/ us-gaap_StatementGeographicalAxis
= country_US		 0us-gaap_NotesReceivableNet
/ us-gaap_StatementGeographicalAxis
= country_US
Brazil [Member]    
Financing Receivable Recorded Investment [Line Items]    
Financing receivable $ 11us-gaap_NotesReceivableNet
/ us-gaap_StatementGeographicalAxis
= country_BR		 $ 15us-gaap_NotesReceivableNet
/ us-gaap_StatementGeographicalAxis
= country_BR
[1] (1) Represents non-contingent consideration to be received in 2016 from the sale of the businesses in 2014. See Note 16—Discontinued Operations and Held-For-Sale Businesses.