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Fair Value Disclosures (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2010
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Jun. 30, 2010
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Jun. 30, 2011
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Dec. 31, 2010
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Jun. 30, 2011
Private Equity Funds [Member]
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Jun. 30, 2011
Real Estate Funds [Member]
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Jun. 30, 2011
Hedge Funds [Member]
Long-Short Equity Hedge Funds [Member]
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Jun. 30, 2011
Hedge Funds [Member]
Fixed Income/Credit-Related Hedge Funds [Member]
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Jun. 30, 2011
Hedge Funds [Member]
Event-Driven Hedge Funds [Member]
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Jun. 30, 2011
Hedge Funds [Member]
Multi-Strategy Hedge Funds [Member]
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Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Assets [Member]
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Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Assets [Member]
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Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Assets [Member]
Financial Instruments Owned [Member]
Derivatives And Other Contracts [Member]
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Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Assets [Member]
Financial Instruments Owned [Member]
Derivatives And Other Contracts [Member]
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Jun. 30, 2010
Fair Value, Measurements, Recurring [Member]
Assets [Member]
Financial Instruments Owned [Member]
Derivatives And Other Contracts [Member]
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Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Liabilities [Member]
Financial Instruments Sold, Not Yet Purchased [Member]
Derivatives And Other Contracts [Member]
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Jun. 30, 2010
Fair Value, Measurements, Recurring [Member]
Liabilities [Member]
Financial Instruments Sold, Not Yet Purchased [Member]
Derivatives And Other Contracts [Member]
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Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Liabilities [Member]
Financial Instruments Sold, Not Yet Purchased [Member]
Derivatives And Other Contracts [Member]
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Jun. 30, 2010
Fair Value, Measurements, Recurring [Member]
Liabilities [Member]
Financial Instruments Sold, Not Yet Purchased [Member]
Derivatives And Other Contracts [Member]
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Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Financial Instruments Owned [Member]
Corporate And Other Debt [Member]
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Jun. 30, 2010
Fair Value, Measurements, Recurring [Member]
Financial Instruments Owned [Member]
Corporate And Other Debt [Member]
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Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Financial Instruments Owned [Member]
Corporate And Other Debt [Member]
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Jun. 30, 2010
Fair Value, Measurements, Recurring [Member]
Financial Instruments Owned [Member]
Corporate And Other Debt [Member]
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Jun. 30, 2010
Fair Value, Measurements, Recurring [Member]
Financial Instruments Owned [Member]
Corporate Equities [Member]
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Jun. 30, 2010
Fair Value, Measurements, Recurring [Member]
Financial Instruments Owned [Member]
Corporate Equities [Member]
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Jun. 30, 2011
Revel Entertainment Group, LLC [Member]
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Member]
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Jun. 30, 2010
Revel Entertainment Group, LLC [Member]
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Member]
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Jun. 30, 2010
Revel Entertainment Group, LLC [Member]
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Dec. 31, 2010
Revel Entertainment Group, LLC [Member]
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| Reclassification from level 3 to level 2 | $ 1,200,000,000 | $ 1,900,000,000 | $ 1,800,000,000 | $ 1,400,000,000 | |||||||||||||||||||||||||
| Reclassification from level 2 to level 3 | 800,000,000 | 600,000,000 | 600,000,000 | 800,000,000 | |||||||||||||||||||||||||
| Fair value amount of funds that will be liquidated in the next five years, percentage | 7.00% | 18.00% | |||||||||||||||||||||||||||
| Fair value amount of funds that will be liquidated between five to ten years, percentage | 32.00% | 35.00% | |||||||||||||||||||||||||||
| Fair value amount of funds that have a remaining life of greater than ten years, percentage | 61.00% | 47.00% | |||||||||||||||||||||||||||
| Investments that cannot be redeemed due to certain initial period lock-up restrictions, percentage | 12.00% | 36.00% | 34.00% | 76.00% | |||||||||||||||||||||||||
| Investments that cannot be redeemed due to exit restriction imposed by the hedge fund manager, percentage | 26.00% | 9.00% | |||||||||||||||||||||||||||
| Amount of carrying value of long-term borrowings exceeding fair value | 1,000,000,000 | 1,800,000,000 | |||||||||||||||||||||||||||
| Loss on the write-down of Revel Entertainment Group | 19,000,000 | 951,000,000 | 951,000,000 | ||||||||||||||||||||||||||
| Fair value of discontinued operations | 240,000,000 | 28,000,000 | |||||||||||||||||||||||||||
| Amount of assets (liabilities) reclassified from level 2 to level 1 | 900,000,000 | 1,100,000,000 | 1,800,000,000 | 1,300,000,000 | 1,500,000,000 | 900,000,000 | 1,900,000,000 | 500,000,000 | 1,100,000,000 | ||||||||||||||||||||
| Amount of assets (liabilities) reclassified from level 1 to level 2 | 1,000,000,000 | ||||||||||||||||||||||||||||
| Investments | 9,020,000,000 | 9,752,000,000 | 9,020,000,000 | 9,752,000,000 | |||||||||||||||||||||||||
| Fair value of liabilities | $ 0 | $ 0 | |||||||||||||||||||||||||||