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Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Notes and Loans Payable [Abstract]
Long-term Debt, Gross	$ 351		$ 351
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(2)		(3)
Long-term debt	348		348
Long-term Debt and Lease Obligation	351
Current portion of long-term debt	0		0
Long term debt, Gross, Noncurrent	351		351
Long-term debt, excluding current portion	348		348
Senior unsecured notes, maturing 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350
Notes and Loans Payable [Abstract]
Debt, interest rate, stated percentage	4.875%
Long-term Debt, Gross	$ 350		350
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(2)		(3)
Long-term debt	348		347
Other Debt Obligations [Member]
Notes and Loans Payable [Abstract]
Long-term Debt, Gross	1		1
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net		$ 0	0
Long-term debt	$ 1		$ 1

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Long term debt, Gross, Noncurrent

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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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Face (par) amount of debt instrument at time of issuance.

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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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