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Shareholders' Equity (Details) - USD ($)
shares in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Repurchase Of Shares Of Common Stock [Line Items]        
Value of share repurchases with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date.     $ 45,000,000 $ 5,000,000
Number of shares repurchased with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date.     700 100
Stock Repurchased During Period, Shares 7,788 [1] 28,243 [1] 26,561 [2]  
Stock Repurchased During Period, Value $ 810,000,000 [1] $ 2,394,000,000 [1] $ 1,915,000,000 [2]  
November 2017 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 0 18,240 0  
Stock Repurchased During Period, Value $ 0 $ 1,500,000,000 $ 0  
November 2016 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 0 0 26,561  
Stock Repurchased During Period, Value $ 0 $ 0 $ 1,915,000,000  
August 2018 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 7,788 10,003 0  
Stock Repurchased During Period, Value $ 810,000,000 $ 894,000,000 $ 0  
November 2019 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchase Program, Authorized Amount 2,000,000,000     $ 2,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount 2,000,000,000     2,000,000,000
August 2018 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 296,000,000     $ 296,000,000
[1]
2019 amount excludes and 2018 amount includes the effect of $5 million in share repurchases (0.1 million shares) with trade dates on, or prior to, December 31, 2018 but settlement dates subsequent to December 31, 2018.
[2]
2017 amount excludes the effect of $45 million in share repurchases (0.7 million shares) with trade dates prior to December 31, 2016 but settlement dates subsequent to December 31, 2016.