STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical)	3 Months Ended						9 Months Ended
	Sep. 30, 2023 participant $ / shares	Jun. 30, 2023 $ / shares	Mar. 31, 2023 $ / shares	Sep. 30, 2022 participant $ / shares	Jun. 30, 2022 $ / shares	Mar. 31, 2022 $ / shares	Sep. 30, 2023 participant $ / shares	Sep. 30, 2022 participant $ / shares
Number of incentive compensation deferral plan participants | participant	5			4			5	4
Class A common stock
Dividends declared (in dollars per share)	$ 1.19	$ 1.19	$ 1.19	$ 1.11	$ 1.11	$ 1.11	$ 3.57	$ 3.33
Class B common stock
Dividends declared (in dollars per share)	$ 178.50	$ 178.50	$ 178.50	$ 166.50	$ 166.50	$ 166.50	$ 535.50	$ 499.50