Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014 security	Dec. 31, 2013 security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	$ 11,858	$ 18,322
Greater Than Twelve Months	2,554	1,839
Continuous Unrealized Loss Position, Total	14,412	20,161
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	462	1,085
Greater Than Twelve Months	340	324
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	802	1,409
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1,158	1,484
Corporate bonds [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	10,868	16,918
Greater Than Twelve Months	2,012	1,258
Continuous Unrealized Loss Position, Total	12,880	18,176
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	431	1,018
Greater Than Twelve Months	257	229
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	688	1,247
U.S. Government Bonds [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	149	163
Continuous Unrealized Loss Position, Total	149	163
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	7	14
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	7	14
Foreign government bonds [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months		69
Continuous Unrealized Loss Position, Total		69
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months		1
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		1
RMBS [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	435	488
Greater Than Twelve Months	226	267
Continuous Unrealized Loss Position, Total	661	755
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	11	17
Greater Than Twelve Months	17	24
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	28	41
CMBS [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	131	109
Greater Than Twelve Months	41	43
Continuous Unrealized Loss Position, Total	172	152
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	5	7
Greater Than Twelve Months	13	14
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	18	21
CLOs [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	138	136
Greater Than Twelve Months	48	50
Continuous Unrealized Loss Position, Total	186	186
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	3	2
Greater Than Twelve Months	3	5
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	6	7
State and municipal bonds [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	89	377
Greater Than Twelve Months	54	24
Continuous Unrealized Loss Position, Total	143	401
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	3	20
Greater Than Twelve Months	9	7
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	12	27
Hybrid And redeemable preferred securities [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	48	62
Greater Than Twelve Months	173	197
Continuous Unrealized Loss Position, Total	221	259
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	2	6
Greater Than Twelve Months	41	45
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 43	$ 51