Investments (Schedule of Details Of The Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	$ 706	$ 640
Net Unrealized Gain/(Loss) Position	(10)	30
Fair Value	696	670
OTTI in Credit Losses	413	382	$ 382	$ 380
Corporate bonds [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	85	31
Net Unrealized Gain/(Loss) Position	(21)	(2)
Fair Value	64	29
OTTI in Credit Losses	63	28
ABS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	200	199
Net Unrealized Gain/(Loss) Position	7	13
Fair Value	207	212
OTTI in Credit Losses	108	108
RMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	372	365
Net Unrealized Gain/(Loss) Position	1	12
Fair Value	373	377
OTTI in Credit Losses	194	193
CMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	33	34
Net Unrealized Gain/(Loss) Position	3	4
Fair Value	36	38
OTTI in Credit Losses	42	48
CLOs [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	12	11
Net Unrealized Gain/(Loss) Position	1	3
Fair Value	13	14
OTTI in Credit Losses	5	$ 5
State and municipal bonds [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	4
Net Unrealized Gain/(Loss) Position	(1)
Fair Value	3
OTTI in Credit Losses	$ 1