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Fair Value Disclosure of Financial Instruments (Textual) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fixed Rate Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Notes payable | $ 2,610 | $ 2,500
Notes payable at fair value | 2,710 | 2,540
Variable Rate Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Notes payable | 820 | 1,020
Notes payable at fair value | $ 820 | $ 970

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- Definition Notes Payable Excluding Interest Rate Swaps and Cap Agreements + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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