Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 1,189	$ 1,372
Other comprehensive (loss) income, net of tax
Net unrealized (depreciation) appreciation on securities and derivatives	(428)	442
Net translation (losses) on foreign currencies	(175)	(26)
Postretirement benefits liability adjustment	13	11
Other comprehensive (loss) income, net of tax	(590)	427
Total comprehensive income	599	1,799
Comprehensive income (loss) attributable to noncontrolling interests
Net income attributable to redeemable noncontrolling interest	4	3
Net income attributable to other noncontrolling interests	4	1
Other comprehensive (loss) attributable to redeemable noncontrolling interest	(4)	(2)
Total comprehensive income attributable to noncontrolling interests	4	2
SHAREHOLDERS' COMPREHENSIVE INCOME	$ 595	$ 1,797