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Shareholders' Deficit (Details) - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Repurchase Of Shares Of Common Stock [Line Items]          
Shares Repurchased       20,484 [1] 19,110 [2]
Dollar Value of Shares Repurchased       $ 1,698 [1] $ 1,327 [2]
Remaining Dollar Value of Shares that may be Repurchased $ 1,802     $ 1,802  
Value of share repurchases with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date. $ 14 $ 24      
Number of shares repurchased with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date. 200 300      
Value of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter     $ 45    
Number of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter     700    
November 2016 [Member]          
Repurchase Of Shares Of Common Stock [Line Items]          
Shares Repurchased       0 19,110
Dollar Value of Shares Repurchased       $ 0 $ 1,327
Remaining Dollar Value of Shares that may be Repurchased $ 0     $ 0  
November 2017 [Member]          
Repurchase Of Shares Of Common Stock [Line Items]          
Shares Repurchased       18,240 0
Dollar Value of Shares Repurchased       $ 1,500 $ 0
Remaining Dollar Value of Shares that may be Repurchased 0     $ 0  
August 2018 [Member]          
Repurchase Of Shares Of Common Stock [Line Items]          
Shares Repurchased       2,244 0
Dollar Value of Shares Repurchased       $ 198 $ 0
Remaining Dollar Value of Shares that may be Repurchased 1,802     1,802  
Stock Repurchase Program, Authorized Amount $ 2,000     $ 2,000  
[1] 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.
[2] Includes the effect of $24 million in share repurchases (0.3 million shares) with trade dates on, or prior to, September 30, 2017, but cash settlement dates subsequent to September 30, 2017 and excludes the effect of $45 million in share purchases (0.7 million shares) with trades dates prior to December 31, 2016, but cash settlement dates subsequent to December 31, 2016.