Schedule I Condensed Statement of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Investment and other income	$ 2,324	$ 1,502	$ 1,886
Total revenues	287,597	257,141	242,155
Operating costs:
Interest expense	1,660	1,663	1,704
Total operating costs	263,627	234,736	222,470
Benefit for income taxes	4,578	4,973	3,742
Net earnings	17,285	15,403	13,839
Other comprehensive income (loss)	(1,570)	(236)	582
Comprehensive income	15,715	15,167	14,421
Parent Company [Member]
Revenues:
Investment and other income	494	194	209
Total revenues	494	194	209
Operating costs:
Operating costs	40	27	38
Interest expense	1,583	1,594	1,580
Total operating costs	1,623	1,621	1,618
Loss before income taxes	(1,129)	(1,427)	(1,409)
Benefit for income taxes	231	300	293
Loss of parent company	(898)	(1,127)	(1,116)
Equity in undistributed income of subsidiaries	18,183	16,530	14,955
Net earnings	17,285	15,403	13,839
Other comprehensive income (loss)	(1,570)	(236)	582
Comprehensive income	$ 15,715	$ 15,167	$ 14,421