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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Related Party Transaction [Line Items]
Cash distributions			$ 2,900	$ 2,750
Related Party Transaction Revenue with Affiliates	40	14	106	33
Related Party Transaction Expenditures From Transactions With Affiliates	5	7	15	18
Parent Company
Related Party Transaction [Line Items]
Cash distributions			2,900	2,750
Tax payments to parent company			1,049	681
Tax refund from parent company			$ 6	$ 0

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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