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Shareholders' Equity (Shareholders' Equity Activities) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Jan. 01, 2018
Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Beginning Balance       $ 1,718       $ 1,197 $ 1,718 $ 1,197 $ 725      
Acquisition of noncontrolling interest                   69 (8)      
Cumulative effect of change in accounting policy                       $ 50 $ 144  
Adjusted balance         $ 1,768         1,768 1,341 1,768 1,341 $ 725
Acquisition of noncontrolling interest                   69        
Share-based compensation                 12 10 12      
Tax benefit decrease related to share-based plans                   1        
Common stock issued upon exercise of stock options                 5 2        
Dividends declared to shareholders ($0.32/share)                 (46) (44) (45)      
Repurchases of common stock                 (4) (3) (53)      
Issuance of ESPP shares                 3 3 3      
Investments by noncontrolling interests                 1   1      
Issuance of convertible debt and call spread overlay                   18        
Distributions to noncontrolling interests                 (14) (3) (4)      
Other noncontrolling interests activity                   2 (1)      
Net income $ 59 $ 58 $ 50 42 53 $ 56 $ 64 137 209 310 440      
Net other comprehensive income (loss)                 (77) 12 127      
Ending Balance 1,857       1,718       $ 1,857 $ 1,718 $ 1,197      
Dividends declared per share (usd per share)                 $ 0.32 $ 0.32 $ 0.32      
ASC 842                            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Cumulative effect of change in accounting policy                       21    
ASC 606                            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Cumulative effect of change in accounting policy                       29    
PIC                            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Beginning Balance       2,190       2,091 $ 2,190 $ 2,091 $ 2,088      
Acquisition of noncontrolling interest                     (8)      
Adjusted balance                       2,190 2,091  
Acquisition of noncontrolling interest                   69        
Share-based compensation                 12 10 12      
Tax benefit decrease related to share-based plans                   1        
Common stock issued upon exercise of stock options                 5 2        
Issuance of ESPP shares                 (1) (1) (1)      
Issuance of convertible debt and call spread overlay                   18        
Ending Balance 2,206       2,190       2,206 2,190 2,091      
Retained Earnings                            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Beginning Balance       1,235       854 1,235 854 467      
Cumulative effect of change in accounting policy                         144  
Adjusted balance                       1,285 998  
Dividends declared to shareholders ($0.32/share)                 (46) (44) (45)      
Net income                 202 281 432      
Ending Balance 1,441       1,235       1,441 1,235 854      
Retained Earnings | ASC 842                            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Cumulative effect of change in accounting policy                       21    
Retained Earnings | ASC 606                            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Cumulative effect of change in accounting policy                       29    
Treasury Stock                            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Beginning Balance       (817)       (818) (817) (818) (769)      
Adjusted balance                       (817) (818)  
Repurchases of common stock                 (4) (3) (53)      
Issuance of ESPP shares                 4 4 4      
Ending Balance (817)       (817)       (817) (817) (818)      
AOCL                            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Beginning Balance       (910)       (922) (910) (922) (1,049)      
Adjusted balance                       (910) (922)  
Net other comprehensive income (loss)                 (77) 12 127      
Ending Balance (987)       (910)       (987) (910) (922)      
NCI                            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Beginning Balance       $ 20       $ (8) 20 (8) (12)      
Adjusted balance                       $ 20 $ (8)  
Investments by noncontrolling interests                 1   1      
Distributions to noncontrolling interests                 (14) (3) (4)      
Other noncontrolling interests activity                   2 (1)      
Net income                 7 29 8      
Net other comprehensive income (loss)                     0      
Ending Balance $ 14       $ 20       $ 14 $ 20 $ (8)