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Debt and Credit Agreements - Schedule of Debt (Details) - USD ($) | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Net premium (discount) | $ 164,000,000 | $ 185,000,000
Unamortized debt issuance costs | (8,000,000) | (9,000,000)
Long-term debt | 3,105,000,000 | 3,125,000,000
Current portion of long-term debt | $ 124,000,000 | 0
6.51% weighted-average private placement senior notes |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 6.51% |
Total debt | $ 37,000,000 | 37,000,000
Current portion of long-term debt | $ 37,000,000 |
5.58% weighted-average senior notes |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 5.58% |
Total debt | $ 87,000,000 | 87,000,000
Current portion of long-term debt | $ 87,000,000 |
3.65% weighted-average private placement senior notes |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 3.65% |
Total debt | $ 825,000,000 | 825,000,000
4.375% senior notes due June 1, 2024 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 4.375% |
Total debt | $ 750,000,000 | 750,000,000
3.90% senior notes due May 15, 2027 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 3.90% |
Total debt | $ 750,000,000 | 750,000,000
4.375% senior notes due March 15, 2029 |  |
Debt Instrument [Line Items] |  |
Stated percentage | 4.375% |
Total debt | $ 500,000,000 | 500,000,000
Revolving credit facility |  |
Debt Instrument [Line Items] |  |
Total debt | $ 0 | $ 0

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