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Debt - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 USD ($) | Oct. 31, 2020 GBP (£) | Oct. 31, 2020 AUD ($) | Oct. 31, 2020 EUR (€) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 GBP (£) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 GBP (£) | Jun. 30, 2020 AUD ($) | Jun. 30, 2020 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 GBP (£) | Dec. 31, 2020 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 3,500,000,000 |  |  |  |  |  |  |  |  |  |  | $ 2,926,000,000 | $ 1,029,000,000 |  |
Commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1,000,000,000
Repayments of debt | 772,000,000 | £ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes | Senior Notes Due 2024 and 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |
Senior notes | Senior Notes, Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 500,000,000 | $ 500,000,000 |  |  |  |  |  | $ 500,000,000 |  |  |
Effective interest rate |  |  |  |  | 4.00% | 4.00% |  |  |  |  |  | 4.00% |  | 4.00% | 4.00%
Senior notes | Senior Notes, Due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 500,000,000 | $ 500,000,000 |  |  |  |  |  | $ 500,000,000 |  |  |
Effective interest rate |  |  |  |  | 4.13% | 4.13% |  |  |  |  |  | 4.13% |  | 4.13% | 4.13%
Senior notes | Senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 250,000,000 |
Effective interest rate |  |  |  |  | 2.75% |  |  |  |  |  |  | 2.75% |  | 2.75% | 2.75%
Senior notes | Senior notes due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 650,000,000
Effective interest rate |  |  |  |  | 1.75% |  |  |  |  |  |  | 1.75% |  | 1.75% | 1.75%
Term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 1,441,000,000 |  |  |  |  |  |  |  |  |  |
Term loan | Term Loan Payable, EUR, Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | € |  |  |  |  |  |  |  |  |  |  | € 500,000,000 |  |  |  |
Term loan | Term Loan Payable, EUR, Due 2022-2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 0.65% |  |  |  |  |  |  | 0.65% |  | 0.65% | 0.65%
Repayments of debt | 292,000,000 |  |  | € 250,000,000 |  |  |  |  |  |  |  |  |  |  |
Term loan | Term Loan Payable, GBP, Due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | £ |  |  |  |  |  |  | £ 300,000,000 |  | £ 150,000,000 |  |  |  |  |  |
Term loan | Term Loan Payable, AUD, Due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | 358,000,000 |  | $ 500 |  |  |  |  |  |  | $ 300 |  |  |  |  |
Term loan | Term Loan Payable, USD, Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | 381,000,000 |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
Term loan | Term Loan Payable, EUR, Due 2023-2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 0.80% |  |  |  |  |  |  | 0.80% |  | 0.80% | 0.80%
Repayments of debt | 410,000,000 |  |  | € 350,000,000 |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt issuance |  |  |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 4,000,000,000.0 |  |  |  |  |  |  | $ 4,000,000,000.0 |  |  |
Repayments of debt | $ 1,250,000,000 |  |  |  |  |  |  |  |  |  |  | $ 4,000,000,000.0 |  |  |

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