Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings, including noncontrolling interests	$ 11	$ 113	$ 311	$ 280
Net unrealized gains on securities:
Unrealized holding gains on securities arising during the period	59	89	299	427
Reclassification adjustment for realized (gains) losses included in net earnings	8	(1)	3	20
Total net unrealized gains on securities	67	88	302	447
Net unrealized gains on cash flow hedges	0	0	1	4
Foreign currency translation adjustments	7	(3)	11	4
Pension and other postretirement plans adjustments	0	0	0	1
Other comprehensive income, net of tax	74	85	314	456
Total comprehensive income, net of tax	85	198	625	736
Less: Comprehensive income attributable to noncontrolling interests	0	5	2	23
Comprehensive income attributable to shareholders	$ 85	$ 193	$ 623	$ 713