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Debt And Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Apr. 25, 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)
September 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         67,000,000 $ 69,000,000      
Stockholders' Equity [Abstract]                  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax         2,000,000 5,000,000      
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     $ 120,000,000  
Preferred Stock, Liquidation Preference, Value       $ 119,000,000          
Payments for Repurchase of Redeemable Preferred Stock 0   $ 0 126,000,000 144,000,000 126,000,000      
Dividends, Preferred Stock, Cash 0.49375                
Dividends, Preferred Stock, Cash 3,000,000                
Preferred Stock Redemption $ 0 $ 2,000,000 0 10,000,000 $ (3,000,000) $ (10,000,000)      
Stock Repurchased During Period, Shares 3.0       5.0 1.5      
Stock Repurchased and Retired During Period, Value $ 115,000,000       $ 205,000,000 $ 45,000,000      
Treasury Stock Acquired, Average Cost Per Share $ 45.45       $ 43.72 $ 30.64      
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (57,000,000)   10,000,000   $ (57,000,000) $ 10,000,000 $ (122,000,000)   $ (54,000,000)
Repayments of Long-term Debt $ 0   $ 129,000,000   153,000,000 244,000,000      
Senior Notes [Member]                  
Stockholders' Equity [Abstract]                  
Repayments of Long-term Debt         $ 153,000,000 89,000,000      
Senior Debt Obligations [Member]                  
Stockholders' Equity [Abstract]                  
Early Repayment of Senior Debt           15,000,000      
Medium-term Notes [Member]                  
Stockholders' Equity [Abstract]                  
Early Repayment of Senior Debt           $ 11,000,000      
SERIES I PREFERRED STOCK [Member]                  
Stockholders' Equity [Abstract]                  
Preferred Stock, Liquidation Preference, Value       27,000,000          
Series J Preferred Stock [Member]                  
Stockholders' Equity [Abstract]                  
Preferred Stock, Liquidation Preference, Value       59,000,000          
Series G Preferred Stock [Member]                  
Stockholders' Equity [Abstract]                  
Preferred Stock, Liquidation Preference, Value       $ 33,000,000