Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings, including noncontrolling interests	$ 141	$ 155
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period	(279)	125
Reclassification adjustment for realized (gains) losses included in net earnings	2	0
Total net unrealized gains (losses) on securities	(277)	125
Net unrealized losses on cash flow hedges	(11)	(1)
Foreign currency translation adjustments	1	0
Other comprehensive income (loss), net of tax	(287)	124
Total comprehensive income (loss), net of tax	(146)	279
Less: Comprehensive income (loss) attributable to noncontrolling interests	(4)	2
Comprehensive income (loss) attributable to shareholders	$ (142)	$ 277