Investments (Details - UCG Fixed maturities) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012 Portion At Amortized Cost Disclosure [Member]	Dec. 31, 2011 Portion At Amortized Cost Disclosure [Member]	Dec. 31, 2012 Fair Value Disclosure [Member]	Dec. 31, 2011 Fair Value Disclosure [Member]	Dec. 31, 2012 Unrealized Gain [Member]	Dec. 31, 2011 Unrealized Gain [Member]	Dec. 31, 2012 Unrealized Loss Or Write Down [Member]	Dec. 31, 2011 Unrealized Loss Or Write Down [Member]
Gross Unrealized Appreciation (Depreciation) on Fixed Maturities By Type [Abstract]
Federal government and agency		$ 509	$ 552	$ 902	$ 958	$ 393	$ 406	$ 0	$ 0
State and local government		2,169	2,185	2,437	2,456	270	274	(2)	(3)
Foreign government		1,197	1,173	1,322	1,274	126	103	(1)	(2)
Corporate		10,590	9,460	11,881	10,485	1,308	1,070	(17)	(45)
Federal agency mortgage-backed		121	9	122	9	1	0	0	0
Other mortgage-backed		82	73	89	79	11	10	(4)	(4)
Other asset-backed		797	777	936	926	145	160	(6)	(11)
Total		15,465	14,229	17,689	16,187	2,254	2,023	(30)	(65)
One Year Or Less [Abstract]
Investment grade		494		488				(6)
Below investment grade		125		123				(2)
More Than One Year [Abstract]
Investment grade		207		195				(12)
Below investment grade		$ 36		$ 26				$ (10)
Number Of Issues Fixed Maturities One Year Or Less Investment Grade	200
Number Of Issues Fixed Maturities One Year Or Less Below Investment Grade	67
Number Of Issues Fixed Maturities More Than One Year Investment Grade	39
Number Of Issues Fixed Maturities More Than One Year Below Investment Grade	14