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Debt Obligations (Interest Expense Recognized on Convertible Senior Notes in Condensed Consolidated Statements of Income) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
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Mar. 31, 2013
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Mar. 31, 2012
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| Debt Disclosure [Abstract] | ||
| Accretion of debt discount | $ 1 | $ 1 |
| Contractual interest | 1 | 1 |
| Total interest expense recognized on the 2013 Convertible Notes | $ 2 | $ 2 |
| X | ||||||||||
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- Definition
Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Interest expense related to convertible debt instruments which has been recognized for the period, including the contractual interest coupon and amortization of the debt discount, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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