Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015 security	Dec. 31, 2014 security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	$ 5,709	$ 5,642
Greater Than Twelve Months	2,319	5,320
Continuous Unrealized Loss Position, Total	8,028	10,962
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	239	219
Greater Than Twelve Months	250	354
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	489	573
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	801	1,019
Equity AFS Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months		37
Greater Than Twelve Months
Continuous Unrealized Loss Position, Total		37
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months		1
Greater Than Twelve Months
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses		1
Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	5,709	5,605
Greater Than Twelve Months	2,319	5,320
Continuous Unrealized Loss Position, Total	8,028	10,925
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	239	218
Greater Than Twelve Months	250	354
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	489	572
Corporate Bonds [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	4,932	4,799
Greater Than Twelve Months	1,617	4,465
Continuous Unrealized Loss Position, Total	6,549	9,264
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	224	207
Greater Than Twelve Months	155	244
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	379	451
Asset-backed Securities [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	72	91
Greater Than Twelve Months	280	323
Continuous Unrealized Loss Position, Total	352	414
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	2	2
Greater Than Twelve Months	33	41
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	35	43
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	15
Continuous Unrealized Loss Position, Total	15
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	640	447
Greater Than Twelve Months	139	241
Continuous Unrealized Loss Position, Total	779	688
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	11	7
Greater Than Twelve Months	10	14
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	21	21
CMBS [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months		121
Greater Than Twelve Months	13	19
Continuous Unrealized Loss Position, Total	13	140
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months		1
Greater Than Twelve Months	9	10
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	9	11
CLOs [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	4	110
Greater Than Twelve Months	68	70
Continuous Unrealized Loss Position, Total	72	180
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months		1
Greater Than Twelve Months	1	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1	2
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	30	6
Greater Than Twelve Months	30	26
Continuous Unrealized Loss Position, Total	60	32
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	1
Greater Than Twelve Months	4	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	5	4
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	16	31
Greater Than Twelve Months	172	176
Continuous Unrealized Loss Position, Total	188	207
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Greater Than Twelve Months	38	40
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 38	$ 40