Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings, including noncontrolling interests	$ 326	$ 141
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period	384	(279)
Reclassification adjustment for realized (gains) losses included in net earnings	(3)	2
Total net unrealized gains (losses) on securities	381	(277)
Net unrealized gains (losses) on cash flow hedges	11	(11)
Foreign currency translation adjustments	4	1
Other comprehensive income (loss), net of tax	396	(287)
Total comprehensive income (loss), net of tax	722	(146)
Less: Comprehensive income (loss) attributable to noncontrolling interests	(3)	(4)
Comprehensive income (loss) attributable to shareholders	$ 725	$ (142)