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Subsequent events- Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2020
Jan. 24, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent Events          
Accelerated share repurchases settlement receipt     $ 250,000,000 $ 125,000,000 $ 75,000,000
Common stock purchases     256,012,000 127,465,000 77,420,000
Treasury stock          
Subsequent Events          
Common stock purchases     271,752,000 127,379,000 81,938,000
Capital surplus          
Subsequent Events          
Common stock purchases     (15,740,000) 86,000 (4,518,000)
Accelerate Share Repurchase | Treasury stock          
Subsequent Events          
Common stock purchases     266,000,000 $ 125,000,000 80,000,000
Accelerate Share Repurchase | Capital surplus          
Subsequent Events          
Common stock purchases     $ 16,000,000   $ 5,000,000
Subsequent event | Preferred class B          
Subsequent Events          
Preferred stock redemption date   Feb. 24, 2020      
Preferred stock dividend rate percentage   8.25%      
Preferred stock redemption price per share   $ 25.00      
Accrued and unpaid dividends on each share   0.1375      
Preferred Stock Redemption Payment Per Share   $ 25.1375      
Subsequent event | Accelerate Share Repurchase          
Subsequent Events          
Stock repurchase program authorized amount $ 500,000,000        
Subsequent event | Accelerate Share Repurchase | Treasury stock          
Subsequent Events          
Common stock purchases 400,000,000        
Subsequent event | Accelerate Share Repurchase | Capital surplus          
Subsequent Events          
Common stock purchases $ 100,000,000