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
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation
Balance at the beginning of the 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 the end of the period	(532)	(551)	(532)	(551)
Derivatives embedded in life and annuity contracts
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation
Balance at the beginning of the 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 the end of the period	(283)	(551)	(283)	(551)
Liabilities held for sale
Fair Value Liabilities Measured on Recurring Basis Unobservable Input Reconciliation Calculation
Total gains (losses) included in: net income	16		16
Transfer to held for sale	(265)		(265)
Issues	(2)		(2)
Settlements	2		2
Balance at the end of the period	$ (249)		$ (249)