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Capital Structure (Details) - USD ($)
6 Months Ended
May 15, 2018
May 13, 2018
Mar. 29, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt outstanding:            
Preferred stock, par value (in dollars per share)       $ 1   $ 1
Repayments of long-term debt       $ 401,000,000 $ 0  
Noncumulative Preferred Stock            
Debt outstanding:            
Preferred stock, issued shares (in shares)     23,000      
Preferred stock, dividend rate     5.625%      
Preferred stock, par value (in dollars per share)     $ 1.00      
Preferred stock, shares liquidation preference (in dollars per share)     $ 25,000      
Proceeds from issuance of redeemable preferred stock     $ 575,000,000      
Preferred stock, redemption price per share (in dollars per share)     $ 25,000      
Period after occurrence of certain rating agency events in which redemption of debt in whole permissible     90 days      
Senior Notes, Due 2021            
Debt outstanding:            
Debt instrument, face amount     $ 250,000,000      
Senior Notes, Due 2023            
Debt outstanding:            
Debt instrument, face amount     $ 250,000,000      
Junior Subordinated Debentures Due 2067 at 6.125%            
Debt outstanding:            
Debt instrument, face amount   $ 224,000,000        
Note stated interest rate (as a percent)   6.125%        
Redemption price, percentage of principal amount redeemed   100.00%        
Senior Debentures Due 2018 at 6.75%            
Debt outstanding:            
Note stated interest rate (as a percent) 6.75%          
Redemption price, percentage of principal amount redeemed 100.00%          
Repayments of long-term debt $ 176,000,000          
London Interbank Offered Rate (LIBOR) | Senior Notes, Due 2021            
Debt outstanding:            
Basis spread on variable rate     0.43%      
London Interbank Offered Rate (LIBOR) | Senior Notes, Due 2023            
Debt outstanding:            
Basis spread on variable rate     0.63%