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Seasonal Financing (Details) - USD ($) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Mar. 19, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 20, 2017
Debt Instrument [Line Items] |  |  |  |  |
Short-term borrowings | $ 128,000,000 |  | $ 969,000 | $ 400,000,000 |
Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding letters of credit | 10,000,000 |  | 11,000,000 | 13,000,000 |
Revolving Credit Facility | Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate commitment under the credit facility |  | $ 1,400,000,000 |  |  | $ 1,600,000,000
Short-term borrowings | $ 128,000,000 |  | $ 0 | $ 400,000,000 |
Revolving Credit Facility | Credit Agreement | Minimum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin for loans (as a percent) | 1.25% |  |  |  |
Revolving Credit Facility | Credit Agreement | Minimum | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin for loans (as a percent) | 0.25% |  |  |  |
Revolving Credit Facility | Credit Agreement | Maximum | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin for loans (as a percent) | 1.75% |  |  |  |
Revolving Credit Facility | Credit Agreement | Maximum | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin for loans (as a percent) | 0.75% |  |  |  |
Revolving Credit Facility, Asset Based | Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate commitment under the credit facility | $ 1,110,000,000 |  |  |  |
Revolving Credit Facility, Secured | Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate commitment under the credit facility | $ 294,000,000 |  |  |  |

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