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DEBT - Narrative (Details) |  |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2021 USD ($) | Aug. 11, 2021 USD ($) | Apr. 22, 2020 USD ($) | Aug. 31, 2021 USD ($) extension | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of debt issued |  |  |  |  | $ 5,501,100,000 |  | $ 4,402,200,000
Letters of credit outstanding, amount |  |  |  |  | 700,000 |  |
Commercial paper notes |  |  |  |  | $ 1,500,000,000 | $ 1,100,000,000 |
Appriss Insights | Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Consideration transferred | $ 1,825,000,000 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  |  |  |  | 1 year |  |
Commercial paper, maturity period range |  |  |  |  | 397 days |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, term |  |  |  | 5 years |  |  |
Repayments of revolving credit facility |  |  | $ 225,000,000 |  |  |  |
Credit facility borrowing capacity |  |  |  | $ 1,500,000,000 |  |  |
Line of credit, maximum number of extensions | extension |  |  |  | 3 |  |  |
Line of credit facility, expiration date, extension period |  |  |  | 1 year |  |  |
Outstanding borrowings |  |  |  |  | $ 0 |  |
Line of credit facility, available for borrowing |  |  |  |  | $ 1,000,000,000 |  |
Notes, 2.35%, due September 2031 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  | 2.35% |  |
Aggregate principal amount of debt issued |  | $ 1,000,000,000 |  |  | $ 1,000,000,000 |  | 0
Debt instrument, term |  | 10 years |  |  |  |  |
Notes, 3.6%, due August 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  | 3.60% |  |
Aggregate principal amount of debt issued |  |  |  |  | $ 0 |  | 300,000,000.0
Repayments of revolving credit facility |  | $ 300,000,000 |  |  |  |  |
Notes, Floating Rate, due August 2021 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of debt issued |  |  |  |  | $ 0 |  | 300,000,000.0
Repayments of revolving credit facility |  | $ 300,000,000 |  |  |  |  |
Notes, 2.6%, due December 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  | 2.60% |  | 2.60% |  |
Aggregate principal amount of debt issued |  |  | $ 400,000,000 |  | $ 400,000,000.0 |  | 400,000,000.0
Debt instrument, term |  |  | 5 years |  |  |  |
Notes, 3.1%, due May 2030 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  | 3.10% |  | 3.10% |  |
Aggregate principal amount of debt issued |  |  | $ 600,000,000 |  | $ 600,000,000.0 |  | 600,000,000.0
Debt instrument, term |  |  | 10 years |  |  |  |
Unsecured Revolving Credit Facility Due September 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of debt issued |  |  |  | $ 1,100,000,000 |  |  |
Term loan, due August 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of debt issued |  |  |  | $ 700,000,000 | 700,000,000.0 |  | 0
Outstanding borrowings |  |  |  |  | 700,000,000 |  |
Commercial paper |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount of debt issued |  |  |  |  | $ 500,000,000.0 |  | $ 0

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