Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Preferred stock, par value	$ 1	$ 1
Preferred stock, authorized shares	10,000,000	10,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 1	$ 1
Common stock, authorized shares	400,000,000	400,000,000
Common stock, issued shares	283,186,115	283,186,115
Accumulated other comprehensive income (loss), taxes	$ 8	$ 8
Treasury stock, shares	228,285,906	228,630,003
Non Variable Interest Entity [Member]
Fixed-maturity securities held as available-for-sale, amortized cost	$ 2,077	$ 2,016
Investments pledged as collateral, amortized cost	0	4
Short-term investments, amortized cost	751	374
Premiums receivable (net of allowance for credit losses)	5	5
Medium-term notes, financial instruments carried at fair value	38	98
Variable Interest Entity Primary Beneficiary [Member]
Debt instrument, fair value disclosure	$ 173	$ 291