Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings, including noncontrolling interests	$ 209	$ 208	$ 535	$ 349
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period	356	(148)	740	(427)
Reclassification adjustment for realized (gains) losses included in net earnings	(8)	(3)	(11)	(1)
Total net unrealized gains (losses) on securities	348	(151)	729	(428)
Net unrealized gains (losses) on cash flow hedges	18	(3)	29	(14)
Foreign currency translation adjustments	0	(4)	4	(3)
Other comprehensive income (loss), net of tax	366	(158)	762	(445)
Total comprehensive income (loss), net of tax	575	50	1,297	(96)
Less: Comprehensive income (loss) attributable to noncontrolling interests	0	(2)	(3)	(6)
Comprehensive income (loss) attributable to shareholders	$ 575	$ 52	$ 1,300	$ (90)