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Equity Equity (Stock Repurchases) (Details) - USD ($)
$ / shares in Units, $ in Millions
126 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equity, Class of Treasury Stock [Line Items]    
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 264  
Treasury Stock, Shares 153,028,526 153,891,260
Acquisition of treasury stock (shares) 154,300,000  
Treasury Stock Acquired, Average Cost Per Share $ 12.12  
Treasury Stock, Value, Acquired, Cost Method $ 1,900