Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net earnings, including noncontrolling interests	$ 211	$ 108	$ 383	$ 192
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period	228	(1)	464	135
Reclassification adjustment for realized gains included in net earnings	(56)	(14)	(96)	(34)
Reclassification adjustment for unrealized gains of subsidiaries sold	(18)		(18)
Total net unrealized gains (losses) on securities	154	(15)	350	101
Foreign currency translation adjustments	10	(14)	9	(9)
Pension and other postretirement plans adjustments			1	1
Other comprehensive income (loss), net of tax	164	(29)	360	93
Total comprehensive income, net of tax	375	79	743	285
Less: Comprehensive income (loss) attributable to noncontrolling interests	(10)	12	(47)	(38)
Comprehensive income attributable to shareholders	$ 385	$ 67	$ 790	$ 323