Financing Receivables (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Financing Receivable Recorded Investment [Line Items]
Financing receivable		$ 291	$ 337
Argentina [Member]
Financing Receivable Recorded Investment [Line Items]
Financing receivable		256	278
CAMEROON
Financing Receivable Recorded Investment [Line Items]
Financing receivable	[1]	0	44
UNITED STATES
Financing Receivable Recorded Investment [Line Items]
Financing receivable		20	0
Brazil [Member]
Financing Receivable Recorded Investment [Line Items]
Financing receivable		$ 15	$ 15

[1] (1) Represents non-contingent consideration to be received in 2016 from the sale of the Cameroon businesses in 2014. Balance is classified as short-term as of June 30, 2015. See Note 17—Discontinued Operations and Held-For-Sale Businesses.