Derivatives (Earned Income On Derivatives) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	$ 277	$ 373	$ 294	$ 385
Derivatives Designated as Hedging Instruments [Member] | Net Investment Income [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	35	31	71	55
Derivatives Designated as Hedging Instruments [Member] | Interest Credited to Policyholder Account Balance [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	36	38	71	83
Derivatives Designated as Hedging Instruments [Member] | Other Expenses [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	(1)	(1)	(4)	(2)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Investment Income [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	(2)	(2)	(3)	(3)
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Other Revenues [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	0	15	0	33
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Net Derivative Gains (Losses) [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	200	240	215	229
Derivatives Not Designated or Not Qualifying as Hedging Instruments [Member] | Policyholder Benefits and Claims [Member]
Settlement Payments By Hedge Classification And Income Statement Location
Total earned income	$ 9	$ 52	$ (56)	$ (10)