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Debt - Commercial Paper Program (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument |  |
Debt instrument, term (in months) | 1 month | 1 month
Weighted-average interest rate (as a percent) | 0.22% | 0.30%
Commercial Paper Program |  |
Debt Instrument |  |
Maximum outstanding amount capacity | $ 1,500,000,000 | $ 1,000,000,000
Borrowings | $ 1,020,000,000.00 | $ 130,000,000

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