Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net earnings, including noncontrolling interests	$ 113	$ 88
Net unrealized gains on securities:
Unrealized holding gains on securities arising during the period	79	158
Reclassification adjustment for realized gains included in net earnings	(36)	(28)
Total net unrealized gains on securities	43	130
Foreign currency translation adjustments	(4)	7
Pension and other postretirement plans adjustments		1
Other comprehensive income (loss), net of tax	39	138
Total comprehensive income, net of tax	152	226
Less: Comprehensive income (loss) attributable to noncontrolling interests	(6)	(21)
Comprehensive income attributable to shareholders	$ 158	$ 247