Earnings Per Share and Shareholders' Equity Transactions (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Class Of Stock [Line Items]
Repurchased common shares	0
Accelerated Share Repurchase Agreement [Member]
Class Of Stock [Line Items]
Stock repurchase program, available authorized repurchase amount	$ 330,000,000
Accelerated Share Repurchase Agreement [Member] | Maximum [Member]
Class Of Stock [Line Items]
Repurchases common stock, authorized	$ 1,300,000,000
Open Market Purchases [Member]
Class Of Stock [Line Items]
Repurchased common shares		200,000	1,200,000
Stock Compensation Plans [Member]
Class Of Stock [Line Items]
Antidilutive securities excluded from calculation of earnings per share	300,000	100,000	200,000