Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 12,230	$ 11,312
Equity securities, cost	4,121	3,927
Land, building and equipment, accumulated depreciation	$ 303	$ 285
Common stock, par value	$ 2	$ 2
Common stock, shares authorized	500,000	500,000
Common stock, shares, issued	198,300	198,300
Treasury Stock, Shares	38,000	37,400