Investments (Schedule of Details Of The Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	$ 850	$ 850
Gross Unrealized Gains	49	40
Gross Unrealized Losses and OTTI	70	79
Fair Value	829	811
OTTI in Credit Losses	408	404	437	424
Corporate bonds [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	270	265
Gross Unrealized Gains	20	18
Gross Unrealized Losses and OTTI	43	49
Fair Value	247	234
OTTI in Credit Losses	136	133
RMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	527	550
Gross Unrealized Gains	24	18
Gross Unrealized Losses and OTTI	14	18
Fair Value	537	550
OTTI in Credit Losses	185	184
CMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	53	35
Gross Unrealized Gains	5	4
Gross Unrealized Losses and OTTI	13	12
Fair Value	45	27
OTTI in Credit Losses	$ 87	$ 87