Equity - Changes in equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021		Dec. 31, 2022	Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 8,773,404	$ 8,505,845		$ 8,859,920	$ 8,413,670	[1],[2]
Net income	395,461	387,729	[1]	783,498	839,192	[1],[2]
Other comprehensive income (loss)	365,364	60,350		63,652	21,048	[1],[2]
Dividends paid	$ (171,183)	$ (132,635)		$ (342,359)	$ (265,556)	[1],[2]
Dividends paid (in USD per share)	$ 1.33	$ 1.03		$ 2.66	$ 2.06
Stock incentive plan activity	$ 21,430	$ (1,061)		$ 69,765	$ 42,208	[1],[2]
Liquidation activity		(1,948)			(1,948)
Shares purchased at cost	(50,000)	(50,000)		(100,000)	(280,334)	[1],[2]
Ending balance	9,334,476	8,768,280	[1]	9,334,476	8,768,280	[1]
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	90,523	90,523		90,523	90,523
Ending balance	90,523	90,523		90,523	90,523
Additional Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	360,443	358,677		327,307	329,619
Stock incentive plan activity	17,428	(14,365)		50,564	14,693
Ending balance	377,871	344,312		377,871	344,312
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	15,878,565	15,233,799		15,661,808	14,915,497
Net income	395,237	387,600		783,091	838,757
Dividends paid	(170,919)	(132,635)		(342,016)	(265,490)
Ending balance	16,102,883	15,488,764		16,102,883	15,488,764
Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,843,780)	(1,605,490)		(1,543,198)	(1,566,727)
Other comprehensive income (loss)	364,111	60,397		63,529	21,634
Ending balance	(1,479,669)	(1,545,093)		(1,479,669)	(1,545,093)
Treasury Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(5,723,230)	(5,586,728)		(5,688,429)	(5,370,605)
Stock incentive plan activity	4,002	13,304		19,201	27,515
Shares purchased at cost	(50,000)	(50,000)		(100,000)	(280,334)
Ending balance	(5,769,228)	(5,623,424)		(5,769,228)	(5,623,424)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	10,883	15,064		11,909	15,363
Net income	224	129		407	435
Other comprehensive income (loss)	1,253	(47)		123	(586)
Dividends paid	(264)			(343)	(66)
Liquidation activity		(1,948)			(1,948)
Ending balance	$ 12,096	$ 13,198		$ 12,096	$ 13,198

[1] *Prior period amounts have been reclassified to reflect the income statement reclassification as described in Note 1.

[2] *Prior period amounts have been reclassified to reflect the income statement reclassification as described in Note 1.