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Borrowings (Narrative) (Details) $ in Millions | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) | Nov. 30, 2019 USD ($) | Feb. 28, 2019 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Aug. 31, 2020 USD ($) | Nov. 30, 2019 EUR (€) | Nov. 30, 2019 JPY (¥)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 1.65% |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  |  | $ 5,240.0 |  |  |  |  |
Long-term debt |  |  |  |  | $ 13,817.9 | 16,586.6 | $ 13,817.9 |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 0.0 | $ 252.5 | $ 0.0 |  |  |
Description of derivative activity volume percent |  |  |  |  |  | 9.00% |  |  |  |  |
Debt instrument, interest rate, effective percentage |  |  |  |  | 2.88% | 2.61% | 2.88% |  |  |  |
Maturity Date, 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 3,000.0 |  |  |  |  |
Maturity Date, 2019 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 2,000.0 |  |  |  |  |
Debt instrument, term |  |  |  |  |  | 364 days |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  | $ 4,450.0 |  |  |  |  |  |  |  |
Payments for repurchase and redemption of notes payable |  | $ 2,270.0 |  |  |  |  |  |  |  |  |
Repurchase aggregate principal amount |  | 2,000.0 |  |  |  |  |  |  |  |  |
Long-term debt |  | 2,010.0 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 252.5 |  |  |  |  |  |
Senior Notes | Senior Notes Due May 2050 and September 2060 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  | $ 1,070.0 |  |  |  |  |  |  |
Senior Notes | 2.25% notes due 2050 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 1,000.0 |  |  |  |  |  |  |  | $ 250.0 |  |
Stated interest rate | 2.25% |  |  |  |  | 2.25% |  |  | 2.25% |  |
Proceeds from issuance of debt | $ 988.6 |  |  |  |  |  |  |  |  |  |
Senior Notes | 2.5% notes due 2060 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 850.0 |  |
Stated interest rate |  |  |  |  |  | 2.50% |  |  | 2.50% |  |
Senior Notes | 3.375% notes due 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 1,150.0 |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.375% |  |  | 3.375% |  |  |  |  |
Senior Notes | 3.875% notes due 2039 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 850.0 |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.875% |  |  | 3.875% |  |  |  |  |
Senior Notes | 3.95% notes due 2049 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 1,500.0 |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.95% |  |  | 3.95% |  |  |  |  |
Senior Notes | 4.15% notes due 2059 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 1,000.0 |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.15% |  |  | 4.15% |  |  |  |  |
Senior Notes | November 2019 Euro-denominated Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 1,750.0 |  |  |  |  |  |  |  |  |
Senior Notes | 0.625% Euro denominated notes due 2031 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  | € 600,000,000.0 |
Stated interest rate |  | 0.625% |  |  |  | 0.625% |  |  |  | 0.625% | 0.625%
Senior Notes | 1.7% Euro denominated notes due 2049 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  |  |  |  |  | € 1,000,000,000.00 |
Stated interest rate |  | 1.70% |  |  |  | 1.70% |  |  |  | 1.70% | 1.70%
Senior Notes | November 2019 Yen-denominated Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 356.6 |  |  |  |  |  |  |  |  |
Senior Notes | 0.42% Japanese Yen denominated notes due 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  |  |  |  |  | ¥ 22,920,000,000
Stated interest rate |  | 0.42% |  |  |  | 0.42% |  |  |  | 0.42% | 0.42%
Senior Notes | 0.56% Japanese Yen denominated notes due 2034 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  |  |  |  |  | ¥ 9,280,000,000
Stated interest rate |  | 0.56% |  |  |  | 0.56% |  |  |  | 0.56% | 0.56%
Senior Notes | 0.97% Japanese Yen denominated notes due 2049 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  |  |  |  |  |  | ¥ 7,640,000,000
Stated interest rate |  | 0.97% |  |  |  | 0.97% |  |  |  | 0.97% | 0.97%

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