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Short And Long-Term Debt Unsecured Notes (Details)
3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Rate
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Rate
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
[1]
Jan. 01, 2019
USD ($)
Debt Instrument [Line Items]              
Long-term Debt, Gross       $ 3,472,000,000      
Debt Instrument, Repurchase Amount $ 93            
Gain (Loss) on Extinguishment of Debt 10,000,000 $ (5,000,000) $ (7,000,000) $ 5,000,000 [1] $ (7,000,000) [1] $ (5,000,000)  
Amount that the cumulative credit basket for restricted payments was reset to on January 1, 2019             $ 0
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 | Rate       25.00%      
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 | Rate       50.00%      
Percent of the deficit by which the cumulative credit basket is reduced when consolidated net income is in a deficit position | Rate       1      
General restricted payment basket may be used only for restricted investments (as defined in the indenture to the 9.375% notes)       $ 100,000,000      
Consolidated Leverage Ratio - Unlimited General Restricted Payment Basket - Numerator       3.0      
Consolidated Leverage Ratio - Unlimited Restricted Payment Basket - Denominator       1.0      
Max amount of shares repurchased and dividends declared per year under the 9.375 Credit Agreement       $ 45,000,000      
Net Debt Seasonality Adjustment       200,000,000      
Revolving Credit Facility              
Debt Instrument [Line Items]              
Repayments of Debt $ 83 540,000,000          
Senior Notes | 4.50% Senior Notes              
Debt Instrument [Line Items]              
Long-term Debt, Gross   $ 450,000,000   0 450,000,000    
Interest Rate | Rate   4.50%          
Senior Notes | 9.375% Senior Notes              
Debt Instrument [Line Items]              
Long-term Debt, Gross   $ 550   $ 550,000,000 0    
Interest Rate       9.375%      
Senior Notes | 5.25% Senior Notes              
Debt Instrument [Line Items]              
Long-term Debt, Gross       $ 550,000,000 550,000,000    
Interest Rate       5.25%      
Senior Notes | 4.875% Senior Notes              
Debt Instrument [Line Items]              
Long-term Debt, Gross       $ 407,000,000 $ 500,000,000    
Interest Rate       4.875%      
[1] Former parent legacy items and (Gain) loss on the early extinguishment of debt are recorded in Corporate and Other.