Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) security	Dec. 31, 2014 USD ($) security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	$ 16,725	$ 5,642
Greater Than Twelve Months	2,632	5,803
Continuous Unrealized Loss Position, Total	19,357	11,445
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	842	218
Greater Than Twelve Months	201	289
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 1,043	$ 507
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	1,538	1,019
Equity AFS Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	$ 35	$ 37
Greater Than Twelve Months
Continuous Unrealized Loss Position, Total	$ 35	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	16,690	5,605
Greater Than Twelve Months	2,632	5,803
Continuous Unrealized Loss Position, Total	19,322	11,408
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	841	218
Greater Than Twelve Months	201	289
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	1,042	507
Corporate Bonds [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	15,420	4,799
Greater Than Twelve Months	1,508	4,475
Continuous Unrealized Loss Position, Total	16,928	9,274
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	802	208
Greater Than Twelve Months	170	240
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	972	448
ABS [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	121	91
Greater Than Twelve Months	403	428
Continuous Unrealized Loss Position, Total	524	519
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	1	11
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	4	13
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	13
Continuous Unrealized Loss Position, Total	13
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	2
RMBS [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	711	447
Greater Than Twelve Months	443	574
Continuous Unrealized Loss Position, Total	1,154	1,021
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	20	7
Greater Than Twelve Months	(13)	(12)
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	7	(5)
CMBS [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	99	121
Greater Than Twelve Months	40	41
Continuous Unrealized Loss Position, Total	139	162
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	2	1
Greater Than Twelve Months	1	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	3	7
CLOs [Member] | Fixed Maturity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	85	110
Greater Than Twelve Months	64	83
Continuous Unrealized Loss Position, Total	149	193
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Greater Than Twelve Months	(1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(1)
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	168	6
Greater Than Twelve Months	28	26
Continuous Unrealized Loss Position, Total	196	32
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	10
Greater Than Twelve Months	4	4
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	14	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	73	31
Greater Than Twelve Months	146	176
Continuous Unrealized Loss Position, Total	219	207
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	2
Greater Than Twelve Months	39	40
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ 41	$ 40