Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Diluted , By Common Class [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	6,800	500	6,200	200
Numerator for Basic and Diluted Earnings Per Share - [Abstract]
Net Income	$ 615,122	$ 1,190,952	$ 2,098,389	$ 2,526,272
Denominator for Basic Earnings Per Share - [Abstract]
Weighted Average Shares	577,839	577,254	577,498	576,431
Denominator for Diluted Earnings Per Share - [Abstract]
Adjusted Diluted Weighted Average Shares	581,271	581,559	581,190	580,442
Net Income Per Share
Basic	$ 1.06	$ 2.06	$ 3.63	$ 4.38
Diluted	$ 1.06	$ 2.05	$ 3.61	$ 4.35
Stock Options And SARs
Potential Dilutive Common Shares - [Abstract]
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments	203	1,432	371	1,317
Restricted Stock/Units and Performance Units/Stock [Member]
Potential Dilutive Common Shares - [Abstract]
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments	3,229	2,873	3,321	2,694

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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