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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
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Dec. 31, 2011
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Dec. 31, 2010
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| Summary Of Significant Accounting Policies [Line Items] | ||
| Percent of revenue not exceeded by client | 10.00% | |
| Auction rate securities | $ 84 | $ 94 |
| After-tax future net revenue discount rate | 10.00% | |
| Twelve month period prior to the end of the period for future net revenues calculation | 12 | |
| Estimated useful life range, years, maximum | 39 | |
| Estimated useful life range, years, minimum | 3 | |
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Maximum [Member]
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| Summary Of Significant Accounting Policies [Line Items] | ||
| Mark-to-market threshold above which collateral must be posted | 55 | |
| Depletion calculation holding period, years | 6 | |
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Minimum [Member]
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| Summary Of Significant Accounting Policies [Line Items] | ||
| Mark-to-market threshold above which collateral must be posted | $ 0 | |
| Depletion calculation holding period, years | 3 |
| X | ||||||||||
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- Definition
After Tax Future Net Revenue Discount Rate No definition available.
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- Definition
Mark To Market Exposure Threshold No definition available.
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- Definition
Maximum Revenue Per Client, Percentage No definition available.
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- Definition
Property Depletion Calculation Holding Period, Years No definition available.
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- Details
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- Definition
Twelve month period prior to the end of the period for future net revenues calculation. No definition available.
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- Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. No definition available.
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| X | ||||||||||
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- Definition
The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. No definition available.
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