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Share Repurchase Program (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  |  |  | 2 Months Ended | 12 Months Ended | 122 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 10, 2021 | Oct. 28, 2020 | Feb. 05, 2020 | Feb. 26, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Feb. 26, 2021
Share Repurchase Program |  |  |  |  |  |  |
Increase in authorized amount |  | $ 1,000,000 | $ 1,000,000 |  |  |  |
Authorization effective period |  | 3 years | 3 years |  |  |  |
Remaining balance under share repurchase program |  |  |  |  | $ 481,500 |  |
Common stock repurchased, shares |  |  |  |  | 4,832 | 3,877 |
Common stock repurchased, average price per share |  |  |  |  | $ 431.93 | $ 369.55 |
Common stock repurchased, value |  |  |  |  | $ 2,087,146 | $ 1,432,752 |
Subsequent event [Member] |  |  |  |  |  |  |
Share Repurchase Program |  |  |  |  |  |  |
Increase in authorized amount | $ 1,000,000 |  |  |  |  |  |
Cumulative authorized amount | $ 15,800,000 |  |  |  |  |  |
Authorization effective period | 3 years |  |  |  |  |  |
Common stock repurchased, shares |  |  |  | 1,100 |  |  | 82,100
Common stock repurchased, average price per share |  |  |  | $ 447.49 |  |  | $ 179.65
Common stock repurchased, value |  |  |  | $ 478,400 |  |  | $ 14,700,000

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- Definition 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. + References No definition available. + Details
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