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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings, including noncontrolling interests	$ 477	$ 668	$ 370
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period	297	80	(406)
Reclassification adjustment for realized (gains) losses included in net earnings	(10)	(12)	9
Reclassification for unrealized gains of subsidiaries sold	0	0	(22)
Total net unrealized gains (losses) on securities	287	68	(419)
Net unrealized gains (losses) on cash flow hedges	(4)	(8)	1
Foreign currency translation adjustments	12	7	(14)
Pension and other postretirement plans adjustments	1	0	1
Other comprehensive income (loss), net of tax	296	67	(431)
Total comprehensive income (loss), net of tax	773	735	(61)
Less: Comprehensive income attributable to noncontrolling interests	2	24	10
Comprehensive income (loss) attributable to shareholders	$ 771	$ 711	$ (71)

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