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Long-Term Debt and Credit Facilities - Narrative (Details) - USD ($) $ in Millions |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Mar. 14, 2022 | Feb. 03, 2022 | May 26, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Debt Instrument [Line Items] |  |  |  |  |
Borrowings under credit facilities |  |  |  | $ 1 | $ 0
Senior Notes 3.15 Percent | Senior Notes | AGUS |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate of debt (as a percent) |  |  | 3.15% |  |
Debt instrument, face amount |  |  | $ 500 |  |
Net proceeds from issuance of debt |  |  | $ 494 |  |
One Month | Letter of Credit | Short Term Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 550 |  |  |
Maximum borrowing duration |  | 1 month |  |  |
Borrowings under credit facilities | $ 400 |  |  |  |
One Month | Letter of Credit | Short Term Loan Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.10% |  |  |
6 Months | Letter of Credit | Short Term Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 150 |  |  |
Maximum borrowing duration |  | 6 months |  |  |
Borrowings under credit facilities | $ 0 |  |  |  |
Thirty Days | Letter of Credit | Short Term Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing duration | 30 days | 30 days |  |  |

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