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Earnings (Loss) Per Common Share and Stockholders' Equity (Share Repurchase Program and Treasury Stock) (Details) - USD ($)
$ / shares in Units, $ in Millions
 41 Months Ended
Mar. 17, 2023
Mar. 31, 2024
Dec. 31, 2023
Jul. 13, 2023
Nov. 11, 2022
Nov. 19, 2021
Class of Stock [Line Items]            
Share repurchase program, authorized amount         $ 400 $ 500
Treasury stock acquired, shares (in shares)   31,200,000        
Treasury stock acquired, average price per common share (in dollars per share)   $ 35.21        
Stock repurchase program, remaining authorized repurchase amount   $ 276        
Treasury stock, shares (in shares)   30,614,343 30,765,023      
Treasury stock, carrying value   $ 1,000 $ 1,000      
Accelerated Share Repurchase (ASR)            
Class of Stock [Line Items]            
Share repurchase program, authorized amount $ 200          
Treasury stock acquired, shares (in shares) 4,800,000          
Treasury stock, acquired, percentage 80.00%          
Treasury stock acquired, average price per common share (in dollars per share) $ 33.12          
Accelerated share repurchases, settlement (payment) or receipt       $ 14