v2.4.0.6

Long-Term Debt (Details) (USD $) | 1 Months Ended | 2 Months Ended | 3 Months Ended
--- | --- | --- | ---
Feb. 13, 2013 | Feb. 16, 2012 | Mar. 31, 2013
Debt Instrument Issuance [Abstract] |  |  |
Debt Instrument Issuance Interest Rate |  |  | 4.75%
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Expiration Date |  |  | Oct. 11, 2016
Eurodollar rate at period end (in hundredths) |  |  | 1.08%
Base rate at period end (in hundredths) |  |  | 3.25%
Quarterly Cash Dividends Common Stock per Share | $ 0.1875 | $ 0.17 |
Commercial Paper [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Average Borrowings Outstanding |  |  | 2,000,000
Weighted average interest rate (in hundredths) |  |  | 0.36%
Revolving Credit Agreement [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity |  |  | 2,000,000,000
Floating Rate Senior Notes due 2014 [Member] |  |  |
Debt Instrument Issuance [Abstract] |  |  |
Debt Instrument Issuance Face Amount |  |  | 350,000,000
4.75% Subsidiary Debt due 2014 [Member] |  |  |
Debt Instrument Issuance [Abstract] |  |  |
Debt Instrument Issuance Face Amount |  |  | 150,000,000

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- Definition Reflects the calculation for the reporting period of the average interest rate on comemrcial paper weighted by the amount of commercial paper outstanding for varing time periods during the period. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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