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Management Agreement and Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transactions [Abstract]
Management fees	$ 30us-gaap_ManagementFeeExpense	$ 30us-gaap_ManagementFeeExpense	$ 30us-gaap_ManagementFeeExpense	$ 29us-gaap_ManagementFeeExpense	$ 31us-gaap_ManagementFeeExpense	$ 35us-gaap_ManagementFeeExpense	$ 37us-gaap_ManagementFeeExpense	$ 33us-gaap_ManagementFeeExpense	$ 119us-gaap_ManagementFeeExpense	$ 136us-gaap_ManagementFeeExpense	$ 113us-gaap_ManagementFeeExpense
Related Party Transaction, Expenses from Transactions with Related Party									8	10	9
Accounts Payable, Related Parties, Current	$ 10				$ 13				$ 10	$ 13

- Definition

Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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