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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Amortized Cost $ 12,336.3  
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 75,000,000 75,000,000
Preferred Stock, Shares Outstanding 0 0
Common Stock, Par or Stated Value Per Share $ 1.00 $ 1.00
Common Stock, Shares Authorized 500,000,000 500,000,000
Common Stock, Shares, Issued 296,932,316 307,565,632
Common Class B [Member]    
Common Stock, Par or Stated Value Per Share $ 1.00 $ 1.00
Common Stock, Shares Authorized 100,000,000 100,000,000
Common Stock, Shares, Issued 0 0