Investments (Schedule of Details Of The Amount Of Credit Losses Of OTTI Recognized In Net Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	$ 763	$ 850
Gross Unrealized Gains	67	40
Gross Unrealized Losses and OTTI	49	79
Fair Value	781	811
OTTI in Credit Losses	380	404	424	390
Corporate bonds [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	38	54
Gross Unrealized Gains	5
Gross Unrealized Losses and OTTI	9	16
Fair Value	34	38
OTTI in Credit Losses	20	32
Asset-backed Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	232	211
Gross Unrealized Gains	32	18
Gross Unrealized Losses and OTTI	23	33
Fair Value	241	196
OTTI in Credit Losses	108	101
RMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	447	550
Gross Unrealized Gains	26	18
Gross Unrealized Losses and OTTI	7	18
Fair Value	466	550
OTTI in Credit Losses	190	184
CMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	46	35
Gross Unrealized Gains	4	4
Gross Unrealized Losses and OTTI	10	12
Fair Value	40	27
OTTI in Credit Losses	$ 62	$ 87