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Summary Of Significant Accounting Policies (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 01, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Loan impairment threshold period | 90 days |  |  |
Threshold of reporting unit goodwill carrying value for further analysis | $ 0 |  |  |
Prospective Adoption Of New Accounting Pronouncements [Abstract] |  |  |  |
Impact of reduction in both other assets and senior notes |  |  |  | $ 9,900,000
Impact of reduction in both total assets and liabilities |  | $ 9,900,000 |  |
Reclassification from Operating Activities to Financing Activities [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Shares withheld from employee awards for tax withholding purposes | $ 61,600,000 | $ 65,000,000 | $ 67,100,000 |

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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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