Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings, including noncontrolling interests	$ 145	$ 63	$ 300	$ 167
Net unrealized gains on securities:
Unrealized holding gains on securities arising during the period	115	213	240	338
Reclassification adjustment for realized (gains) losses included in net earnings	(5)	10	(5)	21
Total net unrealized gains on securities	110	223	235	359
Net unrealized gains on cash flow hedges	2	1	1	4
Foreign currency translation adjustments	4	1	4	7
Pension and other postretirement plans adjustments	0	0	0	1
Other comprehensive income, net of tax	116	225	240	371
Total comprehensive income, net of tax	261	288	540	538
Less: Comprehensive income attributable to noncontrolling interests	0	13	2	18
Comprehensive income attributable to shareholders	$ 261	$ 275	$ 538	$ 520