Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 4,778	$ 3,304	$ 2,920
Other comprehensive income (loss) before income taxes:
Unrealized foreign currency translation gains (losses) during period	510	252	232
Unrealized gains (losses) on fixed maturity securities:
Unrealized holding gains (losses) on fixed maturity securities during period	1,061	5,870	(3,155)
Reclassification adjustment for realized (gains) losses on fixed maturity securities included in net earnings	159	(18)	46
Unrealized gains (losses) on derivatives during period	(1)	(12)	2
Pension liability adjustment during period	(7)	(85)	(25)
Total other comprehensive income (loss) before income taxes	1,722	6,007	(2,900)
Income tax expense (benefit) related to items of other comprehensive income (loss)	251	1,543	(797)
Other comprehensive income (loss), net of tax	1,471	4,464	(2,103)
Total comprehensive income (loss)	$ 6,249	$ 7,768	$ 817