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Condensed Consolidated Statement of Shareholders' Equity (unaudited) - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Deferred Equity Compensation [Member]
Increase (Decrease) in Shareholders' Equity            
Effect of adoption of ASU $ (32)          
Beginning balance (in shares) at Dec. 31, 2017   116,020,852        
Beginning balance at Dec. 31, 2017 6,839 $ 1 $ 573 $ 5,892 $ 372 $ 1
Increase (Decrease) in Shareholders' Equity            
Net income 433     433    
Dividends (in dollars per share) (54)     (54)    
Share-based compensation and other (in shares)   867,024        
Share-based compensation and other 7   7      
Common stock repurchases (in shares)   (10,250,175)        
Common stock repurchases (380)   (380)      
Effect on OCI (262)       (262)  
Ending balance (in shares) at Sep. 30, 2018   106,637,701        
Ending balance at Sep. 30, 2018 6,583 $ 1 200 6,303 78 1
Beginning balance (in shares) at Jun. 30, 2018   109,614,214        
Beginning balance at Jun. 30, 2018 6,634 $ 1 321 6,159 152 1
Increase (Decrease) in Shareholders' Equity            
Net income 161     161    
Dividends (in dollars per share) (17)     (17)    
Share-based compensation and other (in shares)   322,536        
Share-based compensation and other 9   9      
Common stock repurchases (in shares)   (3,299,049)        
Common stock repurchases (130)   (130)      
Effect on OCI (74)       (74)  
Ending balance (in shares) at Sep. 30, 2018   106,637,701        
Ending balance at Sep. 30, 2018 6,583 $ 1 200 6,303 78 1
Beginning balance (in shares) at Dec. 31, 2018   103,672,592        
Beginning balance at Dec. 31, 2018 6,555 $ 1 86 6,374 93 1
Increase (Decrease) in Shareholders' Equity            
Net income 265     265    
Dividends (in dollars per share) (56)     (56)    
Share-based compensation and other (in shares)   650,963        
Share-based compensation and other 2   2      
Common stock repurchases (in shares)   (7,828,412)        
Common stock repurchases (340)   (88) (252)    
Effect on OCI 226       226  
Ending balance (in shares) at Sep. 30, 2019   96,495,143        
Ending balance at Sep. 30, 2019 6,652 $ 1 0 6,331 319 1
Beginning balance (in shares) at Jun. 30, 2019   99,801,012        
Beginning balance at Jun. 30, 2019 6,722 $ 1 0 6,425 295 1
Increase (Decrease) in Shareholders' Equity            
Net income 69     69    
Dividends (in dollars per share) (18)     (18)    
Share-based compensation and other (in shares)   94,808        
Share-based compensation and other 5   5      
Common stock repurchases (in shares)   (3,400,677)        
Common stock repurchases (150)   (5) (145)    
Effect on OCI 24       24  
Ending balance (in shares) at Sep. 30, 2019   96,495,143        
Ending balance at Sep. 30, 2019 $ 6,652 $ 1 $ 0 $ 6,331 $ 319 $ 1