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Investments in Unconsolidated Subsidiaries - Balance sheet and earnings activity (Details) (Eastern Europe Middle East And Africa [Member], Equity Method Investments [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Eastern Europe Middle East And Africa [Member] \| Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Accounts Receivable, Related Parties, Current	$ 426	$ 470
Revenue from Related Parties	1,186
Notes Receivable, Related Parties	102	100
Related Party Contingent Consideration Liability Current	$ 88	$ 86

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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- Definition

For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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