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Borrowings - Schedule of Borrowings (Schedule of Debt, Narrative) (Details) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 09, 2011 | Dec. 06, 2010
4.2% Senior Notes, due December 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  | 4.20% |  | 4.20% |
Senior Notes, maturity date | Dec. 15, 2021 |  | Dec. 31, 2021 | Dec. 31, 2021 |  |
4.5% Senior Notes, due December 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  |  | 4.50% |  |  | 4.50%
Senior Notes, maturity date |  | Dec. 15, 2020 | Dec. 31, 2020 | Dec. 31, 2020 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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