Consolidated Investment Entities (Details) (Consolidated Investment Entities:, USD $)	Mar. 31, 2013	Dec. 31, 2012
Liabilities
Debt	$ 4,595,000,000	$ 4,450,000,000
Other liabilities	301,000,000	166,000,000
Recurring \| Level 1
Assets
Investments:	110,000,000	91,000,000
Total assets at fair value	110,000,000	91,000,000
Recurring \| Level 1 \| Common stocks
Assets
Investments:	110,000,000	91,000,000
Recurring \| Level 2
Assets
Investments:	4,032,000,000	4,060,000,000
Receivables	111,000,000	77,000,000
Other assets	12,000,000	2,000,000
Total assets at fair value	4,155,000,000	4,139,000,000
Liabilities
Other liabilities	301,000,000	166,000,000
Total liabilities at fair value	301,000,000	166,000,000
Recurring \| Level 2 \| Corporate debt securities
Assets
Investments:	240,000,000	251,000,000
Recurring \| Level 2 \| Common stocks
Assets
Investments:	51,000,000	32,000,000
Recurring \| Level 2 \| Other structured investments
Assets
Investments:	54,000,000	57,000,000
Recurring \| Level 2 \| Syndicated loans
Assets
Investments:	3,687,000,000	3,720,000,000
Recurring \| Level 3
Assets
Investments:	216,000,000	219,000,000
Other assets	1,176,000,000	1,214,000,000
Total assets at fair value	1,392,000,000	1,433,000,000
Liabilities
Debt	4,595,000,000	4,450,000,000
Total liabilities at fair value	4,595,000,000	4,450,000,000
Recurring \| Level 3 \| Corporate debt securities
Assets
Investments:	3,000,000	3,000,000
Recurring \| Level 3 \| Common stocks
Assets
Investments:	8,000,000	14,000,000
Recurring \| Level 3 \| Syndicated loans
Assets
Investments:	205,000,000	202,000,000
Recurring \| Total
Assets
Investments:	4,358,000,000	4,370,000,000
Receivables	111,000,000	77,000,000
Other assets	1,188,000,000	1,216,000,000
Total assets at fair value	5,657,000,000	5,663,000,000
Liabilities
Debt	4,595,000,000	4,450,000,000
Other liabilities	301,000,000	166,000,000
Total liabilities at fair value	4,896,000,000	4,616,000,000
Recurring \| Total \| Corporate debt securities
Assets
Investments:	243,000,000	254,000,000
Recurring \| Total \| Common stocks
Assets
Investments:	169,000,000	137,000,000
Recurring \| Total \| Other structured investments
Assets
Investments:	54,000,000	57,000,000
Recurring \| Total \| Syndicated loans
Assets
Investments:	$ 3,892,000,000	$ 3,922,000,000

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