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Shareholders' Deficit (Details) - USD ($)
shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Repurchase Of Shares Of Common Stock [Line Items]    
Shares Repurchased 4,541 [1] 20,484 [2]
Dollar Value of Shares Repurchased $ 476 [1] $ 1,698 [2]
Remaining Dollar Value of Shares that may be Repurchased 630  
Value of share repurchases with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date. $ 9 $ 14
Number of shares repurchased with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date. 90 200
Value of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter $ 5  
Number of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter 50  
November 2017 [Member]    
Repurchase Of Shares Of Common Stock [Line Items]    
Shares Repurchased 0 18,240
Dollar Value of Shares Repurchased $ 0 $ 1,500
Remaining Dollar Value of Shares that may be Repurchased $ 0  
August 2018 [Member]    
Repurchase Of Shares Of Common Stock [Line Items]    
Shares Repurchased 4,541 2,244
Dollar Value of Shares Repurchased $ 476 $ 198
Remaining Dollar Value of Shares that may be Repurchased $ 630  
[1]
Includes the effect of $9 million in share repurchases (0.09 million shares) with trade dates on, or prior to, September 30, 2019, but cash settlement dates subsequent to September 30, 2019 and excludes the effect of $5 million in share repurchases (0.05 million shares) with trade dates on, or prior to, December 31, 2018, but cash settlement dates subsequent to December 31, 2018.
[2]
Includes the effect of $14 million in share repurchases (0.2 million shares) with trade dates prior to September 30, 2018, but cash settlement dates subsequent to September 30, 2018.