Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Premiums	$ 30,855	$ 29,044	$ 28,272
Net investment income	3,033	2,227	2,468
Fee income	402	429	459
Net realized investment gains	171	2	113
Other revenues	355	279	269
Total revenues	34,816	31,981	31,581
Claims and expenses
Claims and claim adjustment expenses	20,298	19,123	19,133
Amortization of deferred acquisition costs	5,043	4,773	4,601
General and administrative expenses	4,677	4,509	4,365
Interest expense	340	339	344
Total claims and expenses	30,358	28,744	28,443
Income before income taxes	4,458	3,237	3,138
Income tax expense	796	540	516
Net income	$ 3,662	$ 2,697	$ 2,622
Net income per share
Basic (in dollars per share)	$ 14.63	$ 10.56	$ 10.01
Diluted (in dollars per share)	$ 14.49	$ 10.52	$ 9.92
Weighted average number of common shares outstanding
Basic (in shares)	248.5	253.5	260.0
Diluted (in shares)	250.8	254.6	262.3