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, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	$ 789	$ 763
Gross Unrealized Gains	67	67
Gross Unrealized Losses and OTTI	63	49
Fair Value	793	781
OTTI in Credit Losses	382	380	408	404
Corporate Bonds [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	87	38
Gross Unrealized Gains	4	5
Gross Unrealized Losses and OTTI	29	9
Fair Value	62	34
OTTI in Credit Losses	31	20
Asset-backed Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	227	232
Gross Unrealized Gains	33	32
Gross Unrealized Losses and OTTI	18	23
Fair Value	242	241
OTTI in Credit Losses	109	108
RMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	431	447
Gross Unrealized Gains	25	26
Gross Unrealized Losses and OTTI	7	7
Fair Value	449	466
OTTI in Credit Losses	192	190
CMBS [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Amortized Cost	44	46
Gross Unrealized Gains	5	4
Gross Unrealized Losses and OTTI	9	10
Fair Value	40	40
OTTI in Credit Losses	$ 50	$ 62