Fair Value of Assets and Liabilities (Level 3 Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fair Value Disclosures [Abstract]
Assets transferred between Level 1 and Level 2	$ 0	$ 0	$ 0	$ 0
Liabilities transferred between Level 1 and Level 2	0	0	0	0
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	1,098	1,676	1,604	2,041
Total gains (losses) included in: Net income	3	5	14	33
Total gains (losses) included in: OCI	(12)	11	3	10
Transfers into Level 3	18	24	22	104
Transfers out of Level 3	0	(2)	(57)	(186)
Balance at beginning of period	(331)	(533)	(553)	(553)
Total gains (losses) included in: net income	9	24	12	93
Sold in LBL disposition			(347)
Sold in LBL disposition			230
Transfer from held for sale		0		0
Transfer from held for sale		0		0
Purchases/Issues	44	40	70	134
Issues	0	(26)	(17)	(76)
Sales	(4)	(39)	(104)	(322)
Sales	0	0	0	0
Settlements	(56)	(58)	(114)	(157)
Settlements	1	3	7	4
Balance at end of period	1,091	1,657	1,091	1,657
Balance at end of period	(321)	(532)	(321)	(532)
Fixed income securities
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	1,095	1,676	1,241	2,060
Total gains (losses) included in: Net income	3	8	13	14
Total gains (losses) included in: OCI	(12)	19	1	18
Transfers into Level 3	18	21	18	101
Transfers out of Level 3	0	0	(55)	(184)
Sold in LBL disposition			4
Transfer from held for sale		(385)		(385)
Purchases/Issues	14	39	37	132
Sales	(4)	(29)	(96)	(311)
Settlements	(55)	(54)	(104)	(150)
Balance at end of period	1,059	1,295	1,059	1,295
Municipal
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	102	225	119	338
Total gains (losses) included in: Net income	0	0	(1)	(12)
Total gains (losses) included in: OCI	0	1	3	21
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	(17)	0
Sold in LBL disposition			0
Transfer from held for sale		(51)		(51)
Purchases/Issues	0	0	0	0
Sales	(1)	(1)	(3)	(122)
Settlements	0	0	0	0
Balance at end of period	101	174	101	174
Corporate
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	883	1,255	1,008	1,501
Total gains (losses) included in: Net income	3	8	14	28
Total gains (losses) included in: OCI	(13)	1	(4)	(37)
Transfers into Level 3	18	21	18	84
Transfers out of Level 3	0	0	(26)	(168)
Sold in LBL disposition			0
Transfer from held for sale		(244)		(244)
Purchases/Issues	4	39	16	132
Sales	(3)	(28)	(92)	(164)
Settlements	(53)	(49)	(95)	(129)
Balance at end of period	839	1,003	839	1,003
ABS
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	105	190	112	199
Total gains (losses) included in: Net income	0	0	0	(1)
Total gains (losses) included in: OCI	1	15	2	30
Transfers into Level 3	0	0	0	17
Transfers out of Level 3	0	0	(12)	(16)
Sold in LBL disposition			0
Transfer from held for sale		(85)		(85)
Purchases/Issues	10	0	21	0
Sales	0	0	0	(8)
Settlements	(2)	(5)	(9)	(21)
Balance at end of period	114	115	114	115
CMBS
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	5	5	1	21
Total gains (losses) included in: Net income	0	0	0	(1)
Total gains (losses) included in: OCI	0	2	0	4
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Sold in LBL disposition			4
Transfer from held for sale		(5)		(5)
Purchases/Issues	0	0	0	0
Sales	0	0	0	(17)
Settlements	0	0	0	0
Balance at end of period	5	2	5	2
Redeemable preferred stock
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period		1	1	1
Total gains (losses) included in: Net income		0	0	0
Total gains (losses) included in: OCI		0	0	0
Transfers into Level 3		0	0	0
Transfers out of Level 3		0	0	0
Sold in LBL disposition			0
Transfer from held for sale		0		0
Purchases/Issues		0	0	0
Sales		0	(1)	0
Settlements		0	0	0
Balance at end of period	0	1	0	1
Equity securities
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	7	6	6	7
Total gains (losses) included in: Net income	0	0	0	0
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
Transfer from held for sale		0		0
Purchases/Issues	30	0	31	0
Sales	0	0	0	(1)
Settlements	0	0	0	0
Balance at end of period	37	6	37	6
Free-standing derivatives, net
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	(5)	(7)	(5)	(27)
Total gains (losses) included in: Net income	0	(2)	1	20
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
Transfer from held for sale		0		0
Purchases/Issues	0	1	2	2
Sales	0	0	0	0
Settlements	(1)	(2)	(4)	(5)
Balance at end of period	(6)	(10)	(6)	(10)
Other assets
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	1	1	0	1
Total gains (losses) included in: Net income		0	1	0
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
Transfer from held for sale		0		0
Purchases/Issues	0	0	0
Sales	0	0	0	0
Settlements	0	0	0	0
Balance at end of period	1	1	1	1
Assets held for sale
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period		0	362	0
Total gains (losses) included in: Net income		(1)	(1)	(1)
Total gains (losses) included in: OCI		(8)	2	(8)
Transfers into Level 3		3	4	3
Transfers out of Level 3		(2)	(2)	(2)
Sold in LBL disposition			(351)
Transfer from held for sale		385		385
Purchases/Issues		0	0	0
Sales		(10)	(8)	(10)
Settlements		(2)	(6)	(2)
Balance at end of period	0	365	0	365
Derivatives embedded in life and annuity contracts
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period	(331)	(533)	(307)	(553)
Total gains (losses) included in: net income	9	8	(5)	77
Sold in LBL disposition			0
Transfer from held for sale		265		265
Issues	0	(24)	(13)	(74)
Sales	0	0	0	0
Settlements	1	1	4	2
Balance at end of period	(321)	(283)	(321)	(283)
Liabilities held for sale
Rollforward of Level 3 assets held at fair value on a recurring basis
Balance at beginning of period		0	(246)	0
Total gains (losses) included in: net income	0	16	17	16
Sold in LBL disposition			230
Transfer from held for sale		(265)		(265)
Issues		(2)	(4)	(2)
Sales		0	0	0
Settlements		2	3	2
Balance at end of period		(249)		(249)
Balance at end of period		$ 0		$ 0