Equity - Changes in equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 7,122,304	$ 6,342,501	$ 6,128,529	$ 5,968,152
Net income	471,733	367,369	1,240,947	911,008
Other comprehensive income (loss)	(26,247)	(250,690)	403,398	(137,386)
Dividends paid	$ (114,105)	$ (113,266)	$ (341,333)	$ (340,291)
Dividends paid (in USD per share)	$ 0.88	$ 0.88	$ 2.64	$ 2.64
Stock incentive plan activity	$ 4,244	$ 8,273	$ 26,388	$ 46,449
Acquisition activity		7		6,262
Shares purchased at cost	(50,000)	(46,767)	(50,000)	(146,767)
Ending balance	7,407,929	6,307,427	7,407,929	6,307,427
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	385,049	455,862	416,585	462,086
Stock incentive plan activity	(10,552)	(3,705)	(42,088)	(9,929)
Ending balance	374,497	452,157	374,497	452,157
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	14,072,152	13,094,252	13,530,666	12,777,538
Net income	471,647	367,253	1,240,362	910,625
Dividends paid	(113,887)	(113,214)	(341,116)	(339,872)
Ending balance	14,429,912	13,348,291	14,429,912	13,348,291
Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,130,506)	(1,945,732)	(2,558,875)	(2,059,048)
Other comprehensive income (loss)	(25,784)	(249,730)	402,585	(136,414)
Ending balance	(2,156,290)	(2,195,462)	(2,156,290)	(2,195,462)
Treasury Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(5,311,236)	(5,364,730)	(5,364,916)	(5,309,130)
Stock incentive plan activity	14,796	11,978	68,476	56,378
Shares purchased at cost	(50,000)	(46,767)	(50,000)	(146,767)
Ending balance	(5,346,440)	(5,399,519)	(5,346,440)	(5,399,519)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	16,322	12,326	14,546	6,183
Net income	86	116	585	383
Other comprehensive income (loss)	(463)	(960)	813	(972)
Dividends paid	(218)	(52)	(217)	(419)
Acquisition activity		7		6,262
Ending balance	$ 15,727	$ 11,437	$ 15,727	$ 11,437