Consolidated Investment Entities (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Future maturities of debt
2015	$ 700
Thereafter	1,544
Total future maturities	2,244
Consolidated Investment Entities:
Syndicated loans
Unpaid principal balance	4,548	5,107
Excess estimated unpaid principal over fair value	(244)	(240)
Fair value	4,304	4,867
Fair value of loans more than 90 days past due	18	71
Fair value of loans in nonaccrual status	18	71
Difference between fair value and unpaid principal of loans more than 90 days past due, loans in nonaccrual status or both	16	62
Debt:
Unpaid principal balance	5,335	5,893
Excess estimated unpaid principal over fair value	(623)	(722)
Fair value	4,712	5,171
Total net gains (losses) recognized in net investment income related to changes in the fair value of financial assets and liabilities for which the fair value option was elected	(122)	58
Fair value of floating rate debts of consolidated pooled investment vehicles managed by Threadneedle	466	364
Future maturities of debt
2013	17
2014	378
2015	88
2016	1,097
Thereafter	4,221
Total future maturities	$ 5,801
Consolidated Investment Entities: \| Maximum
Debt:
Stated interest rate according to the terms of CDO structure (as a percent)	13.20%
Effective interest rate reflecting the impact of derivative contracts (as a percent)	5.50%
Consolidated Investment Entities: \| Minimum
Debt:
Stated interest rate according to the terms of CDO structure (as a percent)	0.00%
Effective interest rate reflecting the impact of derivative contracts (as a percent)	5.00%

The principal amount outstanding of total long-term debt.

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This element represents the fair value of floating rate debts of certain consolidated pooled investment vehicles.

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Reflects the stated interest rate of the long-term debt of consolidated CDOs.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected.

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This item represents, for each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings during the period and in which line in the income statement those gains and losses are reported. This item may also include amounts of gains and losses for other items measured at fair value, but for which the fair value option has not been elected (for instance, items required to be measured at fair value).

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This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

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This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

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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 loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date.

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-Name Accounting Standards Codification

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-Topic 310

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Amount of long-term debt maturities after year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year two following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

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This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

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