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Debt - Short-term Borrowings (Details) | Aug. 02, 2021 USD ($) | Jun. 29, 2021 USD ($) option_plan | May 09, 2016 | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jul. 19, 2018 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Short Term Debt [Line Items] |  |  |  |  |  |  |
Short-term borrowings outstanding |  |  |  | $ 763,500,000 | $ 100,000 | $ 204,700,000 |
Unused borrowing capacity, amount |  |  |  | 2,725,000,000 |  |  |
Commercial Paper |  |  |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |  |  |
Short-term borrowings outstanding |  |  |  | 763,500,000 | 100,000 | 204,700,000 |
New Credit Agreement | Line of Credit |  |  |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |  |  |
Debt instrument term |  | 5 years |  |  |  |  |
Maximum borrowing capacity |  | $ 2,000,000,000 |  |  |  |  | $ 2,000,000,000
Number of extension options | option_plan |  | 2 |  |  |  |  |
Extension term |  | 1 year |  |  |  |  |
Maximum borrowing capacity after exercising extension option |  | $ 2,750,000,000 |  |  |  |  |
Short-term borrowings outstanding |  |  |  | 0 | 0 | 0 |
New Credit Agreement | Letter of Credit |  |  |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 250,000,000 |  |  |  |  |
August2021 Credit Agreement | Line of Credit |  |  |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |  |  |
Debt instrument term | 5 years |  |  |  |  |  |
Maximum borrowing capacity | $ 625,000,000 |  |  |  |  |  |
Five Year Credit Agreement, May 2016 | Line of Credit |  |  |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |  |  |
Debt instrument term |  |  | 5 years |  |  |  |
Short-term borrowings outstanding |  |  |  | 0 | 0 | 0 |
Five Year Credit Agreement, May 2016 | Letter of Credit |  |  |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 875,000,000 |  |  |
Domestic Commercial Paper Program | Commercial Paper |  |  |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |  |  |
Short-term borrowings outstanding |  |  |  | $ 739,900,000 | $ 0 | $ 191,900,000 |
Weighted average interest rate |  |  |  | 0.30% | 0.00% | 2.10% |
Foreign Programs | Commercial Paper |  |  |  |  |  |  |
Short Term Debt [Line Items] |  |  |  |  |  |  |
Short-term borrowings outstanding |  |  |  | $ 23,600,000 | $ 100,000 | $ 12,800,000 |
Weighted average interest rate |  |  |  | 9.50% | 0.20% | 4.30% |

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