Investments (Schedule of Details Of The Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	$ 669	$ 763
Net Unrealized Gain/(Loss) Position	25	17
Fair Value	694	780
OTTI in Credit Losses	378	380	$ 374	$ 377	$ 389	$ 404
Corporate Bonds [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	32	38
Net Unrealized Gain/(Loss) Position	(7)	(5)
Fair Value	25	33
OTTI in Credit Losses	25	20
ABS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	203	221
Net Unrealized Gain/(Loss) Position	14	7
Fair Value	217	228
OTTI in Credit Losses	107	103
RMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	385	447
Net Unrealized Gain/(Loss) Position	15	19
Fair Value	400	466
OTTI in Credit Losses	193	190
CMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	37	46
Net Unrealized Gain/(Loss) Position	1	(6)
Fair Value	38	40
OTTI in Credit Losses	48	62
CLOs [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	12	11
Net Unrealized Gain/(Loss) Position	2	2
Fair Value	14	13
OTTI in Credit Losses	$ 5	$ 5