Derivatives (Earned Income On Derivatives) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	$ (18)	$ 131	$ 276	$ 516
Derivatives Designated as Hedging Instruments [Member] | Net Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	31	27	102	82
Derivatives Designated as Hedging Instruments [Member] | Interest Credited to Policyholder Account Balance [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	39	39	110	122
Derivatives Designated as Hedging Instruments [Member] | Other Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	(1)	(2)	(5)	(4)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Investment Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	(2)	(1)	(5)	(4)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Other Revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	0	11	0	44
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Derivative Gains (Losses) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	62	109	277	338
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Policyholder Benefits and Claims [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	$ (147)	$ (52)	$ (203)	$ (62)