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Share Repurchase Program (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			1 Months Ended	3 Months Ended		9 Months Ended		106 Months Ended
	May 31, 2019	Nov. 13, 2018	Nov. 06, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Nov. 06, 2019
Share Repurchase Program
Increase in authorized amount	$ 1,000,000	$ 1,000,000
Cumulative authorized amount	$ 12,800,000
Authorization effective period	3 years	3 years
Remaining balance under share repurchase program				$ 693,500		$ 693,500
Common stock repurchased, shares				1,025	932	3,585	4,695
Common stock repurchased, average price per share				$ 377.85	$ 306.22	$ 364.84	$ 266.48
Common stock repurchased, value				$ 387,255	$ 285,183	$ 1,307,947	$ 1,251,013
Subsequent event [Member]
Share Repurchase Program
Common stock repurchased, shares			100					76,000
Common stock repurchased, average price per share			$ 393.84					$ 159.13
Common stock repurchased, value			$ 34,800					$ 12,100,000

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Increase in amount authorized under the Company's board-approved share repurchase program.

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Amount of stock repurchase plan authorized.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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