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Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Notes and Loans Payable [Abstract]        
Long-term Debt, Gross $ 350     $ 351
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (4)     (2)
Long-term debt 346     348
Long-term Debt and Lease Obligation 350      
Current portion of long-term debt 0     0
Long term debt, Gross, Noncurrent 350     351
Long-term debt, excluding current portion 346     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 $ 0     350
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 0     (2)
Long-term debt $ 0     348
Senior Notes | Senior unsecured notes, maturing 2029        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount     $ 350  
Notes and Loans Payable [Abstract]        
Debt, interest rate, stated percentage 3.625%   3.625%  
Long-term Debt, Gross $ 350     0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (4)     0
Long-term debt 346     0
Other Debt Obligations [Member]        
Notes and Loans Payable [Abstract]        
Long-term Debt, Gross 0     1
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   $ 0   0
Long-term debt 0     1
Revolving Credit Facility        
Notes and Loans Payable [Abstract]        
Long-term Debt, Gross 0     0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 0     0
Long-term debt $ 0     $ 0