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Short And Long-Term Debt Senior Secured Second Lien Notes (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 4,078  
7.625% Senior Secured Second Lien Notes | Secured Debt    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 550 $ 0
Interest Rate 7.625%  
9.375% Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 550 $ 550
Interest Rate 9.375%