Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net earnings, including noncontrolling interests	$ 402	$ 319	$ 426
Net unrealized gains on securities:
Unrealized holding gains on securities arising during the period	408	161	403
Reclassification adjustment for realized gains included in net earnings	(138)	(68)	(73)
Reclassification adjustment for unrealized gains of subsidiaries sold	(18)	(1)	0
Total net unrealized gains on securities	252	92	330
Foreign currency translation adjustments	6	(1)	8
Pension and other postretirement plans adjustments	2	0	0
Other comprehensive income, net of tax	260	91	338
Total comprehensive income, net of tax	662	410	764
Less: Comprehensive income (loss) attributable to noncontrolling interests	(78)	(17)	(54)
Comprehensive income attributable to shareholders	$ 740	$ 427	$ 818