Fair Value (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Fair Value (Textuals) [Abstract]
Other changes in estimated fair value affecting MSRs	$ 0	$ 0	$ 0	$ 0
Call options in equity securities	(97)		(97)		(72)
Call options in fixed maturity securities	0		0		2
From Level 1 to Level 2	11		11		0
From Level 2 to Level 1	0		0		0
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidation period for other limited partnership interests			2 years
Liquidation period for real estate joint venture commitments			2 years
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidation period for other limited partnership interests			10 years
Liquidation period for real estate joint venture commitments			10 years
Non Recurring [Member] | Other limited partnership interests [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unfunded commitment for investments	6	1	6	1
Non Recurring [Member] | Real estate joint ventures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unfunded commitment for investments	$ 10	$ 0	$ 10	$ 0