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Financing (Senior Notes) (Narrative) (Details) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 14, 2020 USD ($) | Sep. 23, 2020 USD ($) D | Mar. 27, 2020 USD ($) D | Dec. 31, 2020 USD ($) D | Dec. 31, 2019 USD ($)
Senior notes [Member] |  |  |  |  |
Financing |  |  |  |  |
Face amount of senior notes |  |  |  | $ 4,200,000 |
Number of days in annual interest calculation period | D |  |  |  | 360 |
Minimum [Member] | Senior notes [Member] |  |  |  |  |
Financing |  |  |  |  |
Interest rate of senior notes |  |  |  | 1.75% |
Maximum [Member] | Senior notes [Member] |  |  |  |  |
Financing |  |  |  |  |
Interest rate of senior notes |  |  |  | 4.625% |
4.200% Senior Notes due 2030 [Member] |  |  |  |  |
Financing |  |  |  |  |
Face amount of senior notes |  |  | $ 500,000 |  |
Interest rate of senior notes |  |  | 4.20% |  |
Percentage of face value of debt instrument |  |  | 99.959% |  |
Number of days in annual interest calculation period | D |  |  | 360 |  |
4.200% Senior Notes due 2030 [Member] | Senior notes [Member] |  |  |  |  |
Financing |  |  |  |  |
Face amount of senior notes |  |  |  | $ 500,000 | $ 0
Interest rate of senior notes |  |  |  | 4.20% |
1.750% Senior Notes due 2031 [Member] |  |  |  |  |
Financing |  |  |  |  |
Face amount of senior notes |  | $ 500,000 |  |  |
Interest rate of senior notes |  | 1.75% |  |  |
Percentage of face value of debt instrument |  | 99.544% |  |  |
Number of days in annual interest calculation period | D |  | 360 |  |  |
1.750% Senior Notes due 2031 [Member] | Senior notes [Member] |  |  |  |  |
Financing |  |  |  |  |
Face amount of senior notes |  |  |  | $ 500,000 | 0
Interest rate of senior notes |  |  |  | 1.75% |
4.875% Senior Notes due 2021 [Member] |  |  |  |  |
Financing |  |  |  |  |
Face amount of senior notes | $ 500,000 |  |  |  |
Debt redemption price | 500,000 |  |  |  |
Loss on debt extinguishment | $ (200) |  |  |  |
4.875% Senior Notes due 2021 [Member] | Senior notes [Member] |  |  |  |  |
Financing |  |  |  |  |
Face amount of senior notes |  |  |  | $ 0 | $ 500,000
Interest rate of senior notes |  |  |  |  | 4.875%
3.900% Senior Notes due 2029 [Member] | Senior notes [Member] |  |  |  |  |
Financing |  |  |  |  |
Face amount of senior notes |  |  |  | $ 500,000 | $ 500,000
Interest rate of senior notes |  |  |  | 3.90% | 3.90%
4.625% Senior Notes due 2021 [Member] | Senior notes [Member] |  |  |  |  |
Financing |  |  |  |  |
Interest rate of senior notes |  |  |  | 4.625% | 4.625%
4.625% Senior Notes due 2021 [Member] | Senior notes [Member] | Long-term Debt [Member] |  |  |  |  |
Financing |  |  |  |  |
Face amount of senior notes |  |  |  | $ 300,000 | $ 300,000

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