CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Net premiums	$ 11,694.0	$ 11,297.0	$ 10,544.0
Investment income, net of related expenses	2,575.0	2,520.0	2,139.0
Investment related gains (losses), net:
Impairments and change in allowance for credit losses on fixed maturity securities	(21.0)	(31.0)	(28.0)
Other investment related gains (losses), net	(12.0)	122.0	(142.0)
Total investment related gains (losses), net	(33.0)	91.0	(170.0)
Other revenues	360.0	392.0	363.0
Total revenues	14,596.0	14,300.0	12,876.0
Benefits and expenses
Claims and other policy benefits	11,075.0	10,197.0	9,319.0
Interest credited	704.0	697.0	425.0
Policy acquisition costs and other insurance expenses	1,261.0	1,204.0	1,323.0
Other operating expenses	816.0	868.0	786.0
Interest expense	170.0	173.0	147.0
Collateral finance and securitization expense	17.0	29.0	30.0
Total benefits and expenses	14,043.0	13,168.0	12,030.0
Income before income taxes	553.0	1,132.0	846.0
Provision for income taxes	138.0	262.0	130.0
Net income	$ 415.0	$ 870.0	$ 716.0
Earnings per share
Basic earnings per share (in dollars per share)	$ 6.35	$ 13.88	$ 11.25
Diluted earnings per share (in dollars per share)	$ 6.31	$ 13.62	$ 11.00