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Debt And Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Debt And Shareholders' Equity [Line Items]            
Schedule of Long-term Debt Instruments [Table Text Block]    
Long-term debt is summarized as follows:
(In millions)
June 30,
2017
 
December 31, 2016
 
 
 
 
Subordinated notes
$
247

 
$
247

Senior notes
135

 
287

Capital lease obligations
1

 
1

Total
$
383

 
$
535

      
Subordinated Debt $ 247,000,000   $ 247,000,000   $ 247,000,000  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     75,000,000 $ 81,000,000    
Stockholders' Equity [Abstract]            
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     2,000,000 3,000,000    
Senior Notes 135,000,000   135,000,000   287,000,000  
Capital Lease Obligations 1,000,000   1,000,000   1,000,000  
Long-term Debt, Gross 383,000,000   383,000,000   535,000,000  
Preferred Stock, Tender Offer 144,000,000   144,000,000      
Dividends, Preferred Stock, Cash 0.49375          
Dividends, Preferred Stock, Cash 3,000,000          
Preferred Stock Redemption $ 2,000,000 $ 10,000,000 $ 2,000,000 10,000,000    
Stock Repurchased During Period, Shares 1   2      
Stock Repurchased and Retired During Period, Value $ 45,000,000   $ 90,000,000      
Treasury Stock Acquired, Average Cost Per Share $ 40.99   $ 41.70      
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (49,000,000) 23,000,000 $ (49,000,000) 23,000,000 $ (122,000,000) $ (55,000,000)
Repayments of Long-term Debt $ 0 $ 104,000,000 153,000,000 $ 115,000,000    
Senior Notes [Member]            
Stockholders' Equity [Abstract]            
Repayments of Long-term Debt     $ 153,000,000