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Long-term Debt and Credit Agreement - Schedule of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,180
Unamortized deferred financing costs	(18)	$ (23)
Total outstanding indebtedness	1,162	1,180
Less: Amounts expected to be paid within one year	7	22
Total long-term debt due after one year	1,155	1,158
6.125% notes due 2026
Debt Instrument [Line Items]
Long-term debt, gross	400	400
Five Year Variable Rate Term Loan A Due 2023
Debt Instrument [Line Items]
Long-term debt, gross	315	333
Seven Year Variable Rate Term Loan B Due 2025
Debt Instrument [Line Items]
Long-term debt, gross	$ 465	$ 470

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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