Fair Value of Assets and Liabilities (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	$ (533)	$ (707)	$ (553)	$ (723)
Total gains (losses) included in: net income	24	160	93	151
Issues	(26)	(24)	(76)	(53)
Settlements	3	20	4	74
Balance at end of period	(532)	(551)	(532)	(551)
Derivatives embedded in life and annuity contracts
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	(533)	(707)	(553)	(723)
Total gains (losses) included in: net income	8	160	77	151
Transfer to held for sale	265		265
Issues	(24)	(24)	(74)	(53)
Settlements	1	20	2	74
Balance at end of period	(283)	(551)	(283)	(551)
Liabilities held for sale
Rollforward of Level 3 assets held at fair value on a recurring basis
Total gains (losses) included in: net income	16		16
Transfer to held for sale	(265)		(265)
Issues	(2)		(2)
Settlements	2		2
Balance at end of period	$ (249)		$ (249)