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Investments in Affiliates (Schedule of Transactions with Affiliates) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]
Purchases	$ 231	$ 264	$ 208
Sales	$ 0us-gaap_RevenueFromRelatedParties	$ 0us-gaap_RevenueFromRelatedParties	$ 1us-gaap_RevenueFromRelatedParties

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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