|
Long-Term Debt (Details) (USD $)
|
1 Months Ended | 2 Months Ended | 3 Months Ended |
|---|---|---|---|
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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 | |
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Commercial Paper [Member]
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| Line of Credit Facility [Line Items] | |||
| Average Borrowings Outstanding | 2,000,000 | ||
| Weighted average interest rate (in hundredths) | 0.36% | ||
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Revolving Credit Agreement [Member]
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| Line of Credit Facility [Line Items] | |||
| Maximum borrowing capacity | 2,000,000,000 | ||
|
Floating Rate Senior Notes due 2014 [Member]
|
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| Debt Instrument Issuance [Abstract] | |||
| Debt Instrument Issuance Face Amount | 350,000,000 | ||
|
4.75% Subsidiary Debt due 2014 [Member]
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| Debt Instrument Issuance [Abstract] | |||
| Debt Instrument Issuance Face Amount | 150,000,000 |