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Short And Long-Term Debt Unsecured Notes (Details)
6 Months Ended
Jun. 30, 2019
USD ($)
Rate
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Rate
Debt Instrument [Line Items]      
Long-term Debt, Gross [1] $ 3,925,000,000    
Amount that the cumulative credit basket for restricted payments was reset to on January 1, 2019   $ 0  
Consolidated Leverage Ratio - Unlimited General Restricted Payment Basket - Numerator 3.0    
Consolidated Leverage Ratio - Unlimited Restricted Payment Basket - Denominator 1.0    
Consolidated Leverage Ratio - Consolidated Net Income Build - Numerator 4.0    
Consolidated Leverage Ratio - Consolidated Net Income Build - Denominator 1.0    
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    
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%    
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%    
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 Lines of Credit 540,000,000    
Senior Notes | 4.50% Senior Notes      
Debt Instrument [Line Items]      
Long-term Debt, Gross 0   $ 450,000,000
Interest Rate | Rate     4.50%
Senior Notes | 9.375% Senior Notes      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 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 $ 500,000,000   $ 500,000,000
Interest Rate 4.875%    
[1]
Not included in this table is the Company's Unsecured Letter of Credit Facility which had a capacity of $66 million with $58 million utilized at a weighted average rate of 3.33% at June 30, 2019.