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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Treasury Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2016 $ (3,933) $ (4) $ 500 $ (2,050) $ (2,366) $ (13)
Beginning Balance, Shares at Dec. 31, 2016   414 77      
Cumulative Effect on Retained Earnings, Net of Tax 58       58  
Net income (1) 1,140       1,140  
Other comprehensive income (13)         (13)
Vesting of restricted stock units (10) $ 0 $ (10)      
Vesting of restricted stock units, Shares   1 1      
Stock Issued During Period, Value, Stock Options Exercised 4 $ 0 $ 0 4 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   0 0      
Stock compensation expense total 29     29    
Stock Issued During Period, Value, Employee Stock Purchase Plan 44 $ 0   44    
Stock Issued During Period, Shares, Employee Stock Purchase Plans   3        
Stock Repurchased During Period, Value 380   $ (380) 0    
Shares repurchased     19      
Ending Balance at Dec. 31, 2017 4,805 $ 4 $ (890) 2,127 3,564 0
Ending Balance, Shares at Dec. 31, 2017   418 97      
Net income (1) 189       189  
Other comprehensive income (3)         (3)
Vesting of restricted stock units (7) $ 0 $ (7)      
Vesting of restricted stock units, Shares   1 0      
Stock compensation expense total 28     28    
Stock Issued During Period, Value, Employee Stock Purchase Plan 48 $ 0   48    
Stock Issued During Period, Shares, Employee Stock Purchase Plans   3        
Stock Repurchased During Period, Value 375   $ (375) 0    
Shares repurchased     19      
Ending Balance at Dec. 31, 2018 4,685 $ 4 $ (1,272) 2,203 3,753 (3)
Ending Balance, Shares at Dec. 31, 2018   422 116      
Net income (1) 569       569  
Other comprehensive income 5         5
Vesting of restricted stock units (6) $ 0 $ (6)      
Vesting of restricted stock units, Shares   2 0      
Stock compensation expense total 31     31    
Stock Issued During Period, Value, Employee Stock Purchase Plan 51 $ 0   51    
Stock Issued During Period, Shares, Employee Stock Purchase Plans   3        
Stock Repurchased During Period, Value 536   $ (504) (32)    
Shares repurchased     29      
Ending Balance at Dec. 31, 2019 $ 4,799 $ 4 $ (1,782) $ 2,253 $ 4,322 $ 2
Ending Balance, Shares at Dec. 31, 2019   427 145