Fair Value of Assets and Liabilities (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended						3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended							3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended								3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Realized capital gains and losses	Sep. 30, 2012 Realized capital gains and losses	Sep. 30, 2013 Realized capital gains and losses	Sep. 30, 2012 Realized capital gains and losses	Sep. 30, 2013 Net investment income	Sep. 30, 2012 Net investment income	Sep. 30, 2013 Net investment income	Sep. 30, 2012 Net investment income	Sep. 30, 2013 Interest credited to contractholder funds	Sep. 30, 2012 Interest credited to contractholder funds	Sep. 30, 2013 Interest credited to contractholder funds	Sep. 30, 2012 Interest credited to contractholder funds	Sep. 30, 2013 Life and annuity contract benefits	Sep. 30, 2012 Life and annuity contract benefits	Sep. 30, 2013 Life and annuity contract benefits	Sep. 30, 2012 Life and annuity contract benefits	Sep. 30, 2013 Fixed income securities	Sep. 30, 2012 Fixed income securities	Sep. 30, 2013 Fixed income securities	Sep. 30, 2012 Fixed income securities	Sep. 30, 2013 U.S. government and agencies	Sep. 30, 2012 U.S. government and agencies	Jun. 30, 2013 U.S. government and agencies	Jun. 30, 2012 U.S. government and agencies	Sep. 30, 2013 Municipal	Sep. 30, 2012 Municipal	Sep. 30, 2013 Municipal	Sep. 30, 2012 Municipal	Sep. 30, 2013 Corporate	Sep. 30, 2012 Corporate	Sep. 30, 2013 Corporate	Sep. 30, 2012 Corporate	Sep. 30, 2013 Asset-backed securities ("ABS")	Sep. 30, 2012 Asset-backed securities ("ABS")	Sep. 30, 2013 Asset-backed securities ("ABS")	Sep. 30, 2012 Asset-backed securities ("ABS")	Sep. 30, 2013 Residential mortgage-backed securities ("RMBS")	Sep. 30, 2012 Residential mortgage-backed securities ("RMBS")	Sep. 30, 2013 Residential mortgage-backed securities ("RMBS")	Sep. 30, 2012 Residential mortgage-backed securities ("RMBS")	Sep. 30, 2013 Commercial mortgage-backed securities ("CMBS")	Sep. 30, 2012 Commercial mortgage-backed securities ("CMBS")	Sep. 30, 2013 Commercial mortgage-backed securities ("CMBS")	Sep. 30, 2012 Commercial mortgage-backed securities ("CMBS")	Sep. 30, 2012 Redeemable preferred stock	Sep. 30, 2013 Redeemable preferred stock	Jun. 30, 2013 Redeemable preferred stock	Dec. 31, 2012 Redeemable preferred stock	Jun. 30, 2012 Redeemable preferred stock	Sep. 30, 2013 Equity securities	Sep. 30, 2012 Equity securities	Sep. 30, 2013 Equity securities	Sep. 30, 2012 Equity securities	Sep. 30, 2013 Free-standing derivatives, net	Sep. 30, 2012 Free-standing derivatives, net	Sep. 30, 2013 Free-standing derivatives, net	Sep. 30, 2012 Free-standing derivatives, net	Sep. 30, 2013 Other assets	Jun. 30, 2013 Other assets	Dec. 31, 2012 Other assets	Sep. 30, 2012 Other assets	Jun. 30, 2012 Other assets	Dec. 31, 2011 Other assets	Sep. 30, 2013 Assets held for sale	Sep. 30, 2013 Assets held for sale
Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation Calculation Rollforward
Balance at beginning of period	$ 2,395	$ 3,184	$ 3,042	$ 3,095																	$ 2,276	$ 3,062	$ 2,897	$ 3,146	$ 8		$ 7	$ 8	$ 553	$ 1,144	$ 965	$ 1,332	$ 1,383	$ 1,524	$ 1,617	$ 1,405	$ 288	$ 334	$ 251	$ 297	$ 3	$ 4	$ 3	$ 51	$ 41	$ 47	$ 52	$ 60	$ 1	$ 1	$ 1	$ 1	$ 1	$ 125	$ 192	$ 171	$ 43	$ (7)	$ (71)	$ (27)	$ (95)	$ 1	$ 1	$ 1	$ 1	$ 1	$ 1
Total gains (losses) included in: net income	1	4	17	41	(3)	(4)	(1)	19	3	7	15	22	15	143	40	119	10	18	56	32	4	(4)	(4)	23					(6)	(4)	(34)	(10)	10	10	31	16		(9)		20						(1)	(1)	(3)							(3)	2	(7)	(2)	11	20	25							(1)	(1)
Total gains (losses) included in: OCI	11	88	39	154																	16	88	43	148					(1)	14	48	31	1	39	(38)	62	15	34	30	46					1	1	3	9						3		4	6											(8)	(8)
Transfers into Level 3	24	170	111	314																	21	170	108	314		8				53	6	53	21	74	84	210		43	18	43																												3	3
Transfers out of Level 3	(152)	(26)	(449)	(193)																	(150)	(26)	(447)	(193)					(56)		(62)	(26)	(24)		(299)	(38)	(70)	(26)	(86)	(77)				(47)				(5)																				(2)	(2)
Transfer to held for sale																					(385)		(385)						(51)		(51)		(244)		(244)		(85)		(85)						(5)		(5)																					385	385
Purchases	102	92	647	510																	101	69	645	319					2	4	54	46	99	62	459	193			126	74						3	6	5	1						2		164	1	21	2	27
Sales	(103)	(328)	(989)	(660)																	(93)	(320)	(930)	(637)					(18)	(49)	(481)	(254)	(75)	(120)	(351)	(219)		(151)	(81)	(162)							(17)	(1)	(1)						(8)	(49)	(23)											(10)	(10)
Settlements	(62)	(41)	(202)	(118)																	(58)	(50)	(195)	(131)	(1)						(22)	(10)	(49)	(46)	(137)	(86)	(8)	(3)	(33)	(19)	(1)	(1)	(1)	(1)			(1)	(15)										(2)	9	(5)	13							(2)	(2)
Balance at end of period	2,216	3,143	2,216	3,143																	1,732	2,989	1,732	2,989	7	8	7	8	423	1,162	423	1,162	1,122	1,543	1,122	1,543	140	222	140	222	2	3	2	3	37	50	37	50	1	1	1	1	1	128	183	128	183	(10)	(30)	(10)	(30)	1	1	1	1	1	1	365	365
Fair value assets and liabilities measured on recurring basis, gain (loss) included in earnings
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities	25	164	110	192
Free-standing derivatives, assets	6	2	6	2
Free-standing derivatives, liabilities	16	32	16	32
Assets transferred between Level 1 and Level 2	0		0
Liabilities transferred between Level 1 and Level 2	$ 0		$ 0