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Short And Long-Term Debt Unsecured Notes (Details) - USD ($)
$ in Millions
Feb. 05, 2021
Feb. 04, 2021
Jan. 11, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]          
Consolidated Leverage Ratio - Consolidated Net Income Build - Numerator       4.0  
Consolidated Leverage Ratio - Consolidated Net Income Build - Denominator       1.0  
Cumulative Credit Basket increase as a % of Consolidated Net Income when the consolidated leverage ratio is less than 4.0 to 1.0       50.00%  
Cumulative Credit Basket increase as a % of Consolidated Net Income when the consolidated leverage ratio is equal to or greater than 4.0 to 1.0       25.00%  
Consolidated Leverage Ratio - Unlimited General Restricted Payment Basket - Numerator       3.0  
Consolidated Leverage Ratio - Unlimited Restricted Payment Basket - Denominator       1.0  
General restricted payment basket may be used only for restricted investments (as defined in the indenture to the 9.375% notes)       $ 100  
Max amount of shares repurchased and dividends declared per year under the 9.375 Credit Agreement       45  
Net Debt Seasonality Adjustment       200  
Long-term Debt, Gross       $ 3,239  
Senior Notes | 4.875% Senior Notes          
Debt Instrument [Line Items]          
Interest Rate       4.875%  
Long-term Debt, Gross       $ 407 $ 407
Senior Notes | 9.375% Senior Notes          
Debt Instrument [Line Items]          
Interest Rate       9.375%  
Long-term Debt, Gross       $ 550 $ 550
Senior Notes | 5.75% Senior Notes | Subsequent Event          
Debt Instrument [Line Items]          
Interest Rate     5.75%    
Long-term Debt, Gross $ 900 $ 300 $ 600