Fair Value of Assets and Liabilities (Level 3 Assets and Liabilities) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	$ 989	$ 1,483	$ 1,604	$ 1,059	$ 1,604
Total gains (losses) included in: Net income	4	10		2	11
Total gains (losses) included in: OCI	3	11		(6)	15
Transfers into Level 3	0	0		8	4
Transfers out of Level 3	(133)	(30)		(154)	(57)
Sold in LBL disposition		(347)			(347)
Purchases/Issues	6	11		27	26
Sales	(2)	(4)		(50)	(100)
Issues	0			0
Settlements	(52)	(36)		(71)	(58)
Balance at end of period	815	1,098	1,483	815	1,098
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	(326)	(549)	(553)	(323)	(553)
Total gains (losses) included in: net income	9	(12)		5	3
Total gains (losses) included in: OCI	0	0		0	0
Transfers into Level 3	0	0		0	0
Transfers out of Level 3	0	0		0	0
Sold in LBL disposition		230			230
Purchases/Issues	0	(2)		0	(17)
Sales	0	0		0	0
Issues	0			(1)
Settlements	2	2		4	6
Balance at end of period	(315)	(331)	(549)	(315)	(331)
Fixed income securities
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	956	1,137	1,241	1,028	1,241
Total gains (losses) included in: Net income	3	6		1	10
Total gains (losses) included in: OCI	2	11		(7)	13
Transfers into Level 3	0	0		8	0
Transfers out of Level 3	(133)	(30)		(154)	(55)
Sold in LBL disposition		0			4
Purchases/Issues	0	10		19	23
Sales	(2)	(4)		(50)	(92)
Settlements	(51)	(35)		(70)	(49)
Balance at end of period	775	1,095	1,137	775	1,095
Municipal
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	106	119	119	106	119
Total gains (losses) included in: Net income	1	0		1	(1)
Total gains (losses) included in: OCI	(3)	1		(2)	3
Transfers into Level 3	0	0		0	0
Transfers out of Level 3	0	(17)		0	(17)
Sold in LBL disposition		0			0
Purchases/Issues	0	0		0	0
Sales	(2)	(1)		(3)	(2)
Issues	0			0
Settlements	(1)	0		(1)	0
Balance at end of period	101	102	119	101	102
Corporate
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	739	891	1,008	792	1,008
Total gains (losses) included in: Net income	3	6		1	11
Total gains (losses) included in: OCI	3	9		(6)	9
Transfers into Level 3	0	0		2	0
Transfers out of Level 3	(127)	(1)		(127)	(26)
Sold in LBL disposition		0			0
Purchases/Issues	0	10		19	12
Sales	0	(3)		(47)	(89)
Issues	0			0
Settlements	(49)	(29)		(65)	(42)
Balance at end of period	569	883	891	569	883
ABS
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	111	122	112	129	112
Total gains (losses) included in: Net income	(1)	0		(1)	0
Total gains (losses) included in: OCI	2	1		2	1
Transfers into Level 3	0	0		6	0
Transfers out of Level 3	(6)	(12)		(27)	(12)
Sold in LBL disposition		0			0
Purchases/Issues	0	0		0	11
Sales	0	0		0	0
Issues	0			0
Settlements	(1)	(6)		(4)	(7)
Balance at end of period	105	105	122	105	105
CMBS
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period		5	1	1	1
Total gains (losses) included in: Net income		0		0	0
Total gains (losses) included in: OCI		0		(1)	0
Transfers into Level 3		0		0	0
Transfers out of Level 3		0		0	0
Sold in LBL disposition		0	4		4
Purchases/Issues		0		0	0
Sales		0		0	0
Issues				0
Settlements		0		0	0
Balance at end of period	0	5	5	0	5
Redeemable preferred stock
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period			1		1
Total gains (losses) included in: Net income					0
Total gains (losses) included in: OCI					0
Transfers into Level 3					0
Transfers out of Level 3					0
Sold in LBL disposition					0
Purchases/Issues					0
Sales					(1)
Settlements					0
Balance at end of period		0			0
Equity securities
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	39	6	6	37	6
Total gains (losses) included in: Net income	0	0		0	0
Total gains (losses) included in: OCI	1	0		1	0
Transfers into Level 3	0	0		0	0
Transfers out of Level 3	0	0		0	0
Sold in LBL disposition		0			0
Purchases/Issues	6	1		8	1
Sales	0	0		0	0
Issues	0			0
Settlements	0	0		0	0
Balance at end of period	46	7	6	46	7
Free-standing derivatives, net
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	(7)	(7)	(5)	(7)	(5)
Total gains (losses) included in: Net income	1	3		1	1
Total gains (losses) included in: OCI	0	0		0	0
Transfers into Level 3	0	0		0	0
Transfers out of Level 3	0	0		0	0
Sold in LBL disposition		0			0
Purchases/Issues	0	0		0	2
Sales	0	0		0	0
Issues	0			0
Settlements	(1)	(1)		(1)	(3)
Balance at end of period	(7)	(5)	(7)	(7)	(5)
Other assets
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	1	0	0	1	0
Total gains (losses) included in: Net income	0	1		0	1
Total gains (losses) included in: OCI	0	0		0	0
Transfers into Level 3	0	0		0	0
Transfers out of Level 3	0	0		0	0
Sold in LBL disposition		0			0
Purchases/Issues	0	0		0	0
Sales	0	0		0	0
Issues	0			0
Settlements	0	0		0	0
Balance at end of period	1	1	0	1	1
Assets held for sale
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period		347	362		362
Total gains (losses) included in: Net income		0			(1)
Total gains (losses) included in: OCI		0			2
Transfers into Level 3		0			4
Transfers out of Level 3		0			(2)
Sold in LBL disposition		(347)	(4)		(351)
Purchases/Issues		0			0
Sales		0			(8)
Settlements		0			(6)
Balance at end of period		0	347		0
Contractholder funds: Derivatives embedded in life and annuity contracts
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	(326)	(319)	(307)	(323)	(307)
Total gains (losses) included in: net income	9	(12)		5	(14)
Total gains (losses) included in: OCI	0	0		0	0
Transfers into Level 3	0	0		0	0
Transfers out of Level 3	0	0		0	0
Sold in LBL disposition		0			0
Purchases/Issues	0	(2)		0	(13)
Sales	0	0		0	0
Issues	0			(1)
Settlements	2	2		4	3
Balance at end of period	(315)	(331)	(319)	(315)	(331)
Liabilities held for sale
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period		(230)	(246)		(246)
Total gains (losses) included in: net income	$ 0	0		$ 0	17
Total gains (losses) included in: OCI		0			0
Transfers into Level 3		0			0
Transfers out of Level 3		0			0
Sold in LBL disposition		230			230
Purchases/Issues		0			(4)
Sales		0			0
Settlements		0			3
Balance at end of period		$ 0	$ (230)		$ 0