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Shareholders' Equity (Deficit) (Narrative) (Details) - USD ($)
$ in Millions
Mar. 12, 2021
Jan. 30, 2021
Mar. 31, 2018
Subsequent Event      
Stock repurchase Program, Authorized Amount $ 500    
March 2018 Repurchase Program [Member]      
Stock repurchase Program, Authorized Amount     $ 250
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 79  
September 2017 Repurchase Program [Member]      
Stock Repurchase Program, Remaining Authorized Repurchase Amount     $ 23
Share Repurchase 10b5-1 Plan | Subsequent Event      
Stock repurchase Program, Authorized Amount $ 250