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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 810,391	$ 752,842	$ 1,495,339	$ 1,337,094
Weighted-average common shares outstanding (in shares)	209,054,000	214,694,000	211,099,000	214,882,000
Dilutive effect of stock-based awards and stock options (in shares)	874,000	1,130,000	874,000	1,023,000
Diluted weighted-average shares outstanding (in shares)	209,928,000	215,824,000	211,973,000	215,905,000
Basic earnings per share (in dollars per share)	$ 3.88	$ 3.51	$ 7.08	$ 6.22
Diluted earnings per share (in dollars per share)	$ 3.86	$ 3.49	$ 7.05	$ 6.19
Antidilutive securities (in shares)	0	0	0	0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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