Equity - Changes in equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 5,821,166	$ 5,519,210	$ 5,865,493	$ 5,267,346
Impact of adoption of accounting standards					$ (251)
Net income	411,381	366,130	1,099,193	707,987
Other comprehensive income (loss)	66,626	118,785	35,915	275,102
Dividends paid	(98,548)	(88,145)	(299,006)	(264,332)
Stock incentive plan activity	15,423	10,303	64,704	40,210
Acquisition activity				(30)
Shares purchased at cost	(200,000)	(50,000)	(750,000)	(150,000)
Ending balance	$ 6,016,048	$ 5,876,283	$ 6,016,048	$ 5,876,283
Cash dividends per common share (in USD per share)	$ 0.76	$ 0.66	$ 2.28	$ 1.98
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	521,854	534,003	496,592	543,879
Stock incentive plan activity	7,289	(5,806)	32,551	(15,682)
Ending balance	529,143	528,197	529,143	528,197
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	12,114,448	11,095,717	11,625,975	10,930,348
Impact of adoption of accounting standards					1,483
Net income	411,248	365,989	1,098,696	707,545
Dividends paid	(98,484)	(88,030)	(298,942)	(264,217)
Ending balance	12,427,212	11,373,676	12,427,212	11,373,676
Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,795,497)	(1,767,728)	(1,763,086)	(1,924,204)
Impact of adoption of accounting standards					$ (1,734)
Other comprehensive income (loss)	66,582	118,690	35,905	275,166
Ending balance	(1,728,915)	(1,649,038)	(1,728,915)	(1,649,038)
Treasury Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(5,116,119)	(4,439,114)	(4,590,138)	(4,378,897)
Stock incentive plan activity	8,134	16,109	32,153	55,892
Shares purchased at cost	(200,000)	(50,000)	(750,000)	(150,000)
Ending balance	(5,307,985)	(4,473,005)	(5,307,985)	(4,473,005)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	5,957	5,809	5,627	5,697
Net income	133	141	497	442
Other comprehensive income (loss)	44	95	10	(64)
Dividends paid	(64)	(115)	(64)	(115)
Acquisition activity				(30)
Ending balance	$ 6,070	$ 5,930	$ 6,070	$ 5,930