Consolidated Investment Entities (Details) (Consolidated Investment Entities:, USD $)	Dec. 31, 2011	Dec. 31, 2010
Liabilities:
Debt	$ 4,712,000,000	$ 5,171,000,000
Other liabilities	85,000,000	154,000,000
Recurring \| Level 1
Assets
Investments:	75,000,000	26,000,000
Total assets at fair value	75,000,000	26,000,000
Recurring \| Level 1 \| Common Stocks
Assets
Investments:	75,000,000	26,000,000
Recurring \| Level 2
Assets
Investments:	4,355,000,000	5,379,000,000
Receivables	39,000,000	33,000,000
Other assets	2,000,000	8,000,000
Total assets at fair value	4,396,000,000	5,420,000,000
Liabilities:
Other liabilities	85,000,000	154,000,000
Total liabilities at fair value	85,000,000	154,000,000
Recurring \| Level 2 \| Corporate debt securities
Assets
Investments:	314,000,000	418,000,000
Recurring \| Level 2 \| Common Stocks
Assets
Investments:	25,000,000	53,000,000
Recurring \| Level 2 \| Other structured investments
Assets
Investments:	54,000,000	39,000,000
Recurring \| Level 2 \| Syndicated loans
Assets
Investments:	3,962,000,000	4,867,000,000
Recurring \| Level 2 \| Trading securities
Assets
Investments:		2,000,000
Recurring \| Level 3
Assets
Investments:	359,000,000	39,000,000
Other assets	1,108,000,000	887,000,000
Total assets at fair value	1,467,000,000	926,000,000
Liabilities:
Debt	4,712,000,000	5,171,000,000
Total liabilities at fair value	4,712,000,000	5,171,000,000
Recurring \| Level 3 \| Corporate debt securities
Assets
Investments:	4,000,000	6,000,000
Recurring \| Level 3 \| Common Stocks
Assets
Investments:	13,000,000	11,000,000
Recurring \| Level 3 \| Other structured investments
Assets
Investments:		22,000,000
Recurring \| Level 3 \| Syndicated loans
Assets
Investments:	342,000,000
Recurring \| Total
Assets
Investments:	4,789,000,000	5,444,000,000
Receivables	39,000,000	33,000,000
Other assets	1,110,000,000	895,000,000
Total assets at fair value	5,938,000,000	6,372,000,000
Liabilities:
Debt	4,712,000,000	5,171,000,000
Other liabilities	85,000,000	154,000,000
Total liabilities at fair value	4,797,000,000	5,325,000,000
Recurring \| Total \| Corporate debt securities
Assets
Investments:	318,000,000	424,000,000
Recurring \| Total \| Common Stocks
Assets
Investments:	113,000,000	90,000,000
Recurring \| Total \| Other structured investments
Assets
Investments:	54,000,000	61,000,000
Recurring \| Total \| Syndicated loans
Assets
Investments:	4,304,000,000	4,867,000,000
Recurring \| Total \| Trading securities
Assets
Investments:		$ 2,000,000

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