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Significant Accounting Policies Significant Accounting Policies - Notes Receivable (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Notes, loans and financing receivables, gross, Total	$ 81	$ 79
Notes, Loans and Financing Receivable, Gross, Current	52	52
Allowance for Notes, Loans and Financing Receivable, Current	(13)
Interest Income, Notes Receivable	$ 3ocr_InterestIncomeNotesReceivable	$ 4ocr_InterestIncomeNotesReceivable	$ 5ocr_InterestIncomeNotesReceivable

An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date(s) within one year of the balance sheet date or the normal operating cycle, whichever is longer. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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