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Debt - Commercial Paper Program (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |
Term of facility | 1 month | 1 month |
Weighted-average interest rate (as a percent) | 0.30% | 2.04% |
Commercial Paper Program |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity |  |  | $ 1,000,000,000.0
Short-term debt | $ 130,000,000 | $ 93,000,000 |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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