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Summary of Significant Accounting Principles (Details) (USD $)
In Billions, unless otherwise specified |
Sep. 30, 2014
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Dec. 31, 2013
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|---|---|---|
| Accounting Policies [Abstract] | ||
| Unrecognized tax benefits | $ 1.0 | $ 3.1 |
| Unrecognized tax benefits that would impact effective tax rate | 0.7 | |
| Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit | $ (0.4) |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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