Investments (Schedule of Details Of The Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	$ 640	$ 763
Gross Unrealized Losses and OTTI	30	17
Fair Value	670	780
OTTI in Credit Losses	382	380	$ 404	$ 424
Corporate bonds [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	31	38
Gross Unrealized Losses and OTTI	(2)	(5)
Fair Value	29	33
OTTI in Credit Losses	28	20
ABS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	199	221
Gross Unrealized Losses and OTTI	13	7
Fair Value	212	228
OTTI in Credit Losses	108	103
RMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	365	447
Gross Unrealized Losses and OTTI	12	19
Fair Value	377	466
OTTI in Credit Losses	193	190
CMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	34	46
Gross Unrealized Losses and OTTI	4	(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	11	11
Gross Unrealized Losses and OTTI	3	2
Fair Value	14	13
OTTI in Credit Losses	$ 5	$ 5