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Shareholders' Equity Shareholders' Equity (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Depository Shares, Issued     400,000
Preferred Stock, Dividend Rate, Percentage     5.625%
Preferred Stock, Liquidation Preference, Value     $ 100,000
Preferred Stock, Liquidation Preference Per Share     $ 1,000
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants     $ 400,000,000
Issuance of preferred stock $ 0 $ 0 $ 394,000,000
Stock Option      
Common stock shares reserved for future issuance 4,200,000    
Common Stock      
Shares repurchased under equity repurchase program (400,000) (9,500,000) (3,400,000)
Equity Repurchase Program | Common Stock      
Shares repurchased under equity repurchase program 377,000 9,500,000 3,200,000
Average cost per share of shares repurchased under equity repurchase program $ 92.61 $ 75.82 $ 58.55
Stock repurchased during the period $ 35,000,000