Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Preferred stock, shares authorized (in shares)	10,000,000.0	10,000,000.0
Preferred stock, shares issued (in shares)	200,000	200,000
Liquidation preference (in dollars per share)	$ 1,000	$ 1,000
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	600,000,000.0	600,000,000.0
Common stock, shares issued (in shares)	224,500,000	223,900,000
Treasury stock, shares (in shares)	63,400,000	63,400,000