Derivatives (Earned Income On Derivatives) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	$ 302	$ 158	$ 623	$ 432
Derivatives Designated as Hedging Instruments | Net investment income
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	45	34	103	67
Derivatives Designated as Hedging Instruments | Interest credited to policyholder account balances
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	13	32	15	64
Derivatives Designated as Hedging Instruments | Other expenses
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	1	0	(2)	(1)
Derivatives Not Designated or Not Qualifying as Hedging Instruments | Net investment income
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	(1)	(1)	(2)	(2)
Derivatives Not Designated or Not Qualifying as Hedging Instruments | Net derivative gains (losses)
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	240	149	501	368
Derivatives Not Designated or Not Qualifying as Hedging Instruments | Policyholder benefits and claims
Derivative Instruments, Gain (Loss) [Line Items]
Total earned income	$ 4	$ (56)	$ 8	$ (64)