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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
shares in Thousands, $ in Millions
Total
Shares outstanding [Member]
Ordinary shares and APIC [Member]
Retained earnings [Member]
Treasury shares [Member]
AOCL [Member]
 [1]
Total WTW shareholders’ equity [Member]
Non-controlling interests [Member]
Redeemable Noncontrolling interests [Member]
Equity, beginning balance at Dec. 31, 2016 $ 10,183   $ 10,596 [1] $ 1,452 $ (99) $ (1,884) $ 10,065 $ 118  
Equity, beginning balance (in shares) at Dec. 31, 2016   136,297              
Temporary equity, beginning balance at Dec. 31, 2016 [2]                 $ 51
Adoption of New Pronouncement (Accounting Standards Update 2016-16 [Member]) at Dec. 31, 2016 (3)     (3)     (3)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares repurchased (156)     (156)     (156)    
Shares repurchased (in shares)   (1,237)              
Shares cancelled 96       96   96    
Net income (loss) 352     344     344 8  
Net income (loss), total 352                
Dividends declared (77)     (76)     (76) (1)  
Other comprehensive (loss)/income (23)         (24) (24) 1  
Other comprehensive income, redeemable [2]                 2
Other comprehensive income, total (21)                
Issuance of shares under employee stock compensation plans 20   20       20    
Issue of shares under employee stock compensation plans (in shares)   373              
Share-based compensation 14   14       14    
Foreign currency translation (2)   (2)       (2)    
Equity, ending balance at Mar. 31, 2017 10,404   10,628 1,561 (3) (1,908) 10,278 126  
Equity, ending balance (in shares) at Mar. 31, 2017   135,433              
Temporary equity, ending balance at Mar. 31, 2017 [2]                 53
Equity, beginning balance at Dec. 31, 2016 10,183   10,596 [1] 1,452 (99) (1,884) 10,065 118  
Equity, beginning balance (in shares) at Dec. 31, 2016   136,297              
Temporary equity, beginning balance at Dec. 31, 2016 [2]                 51
Adoption of New Pronouncement (Accounting Standards Update 2016-16 [Member]) at Dec. 31, 2016 (3)     (3)     (3)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income (loss), total 339                
Equity, ending balance at Sep. 30, 2017 10,026   10,501 1,130 (40) (1,676) 9,915 111  
Equity, ending balance (in shares) at Sep. 30, 2017   132,283              
Temporary equity, ending balance at Sep. 30, 2017 [2]                 55
Equity, beginning balance at Mar. 31, 2017 10,404   10,628 1,561 (3) (1,908) 10,278 126  
Equity, beginning balance (in shares) at Mar. 31, 2017   135,433              
Temporary equity, beginning balance at Mar. 31, 2017 [2]                 53
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares repurchased (140)     (122) (18)   (140)    
Shares repurchased (in shares)   (1,001)              
Net income (loss) 36     33     33 3  
Net income, redeemable [2]                 5
Net income (loss), total 41                
Dividends declared (81)     (70)     (70) (11) (3) [2]
Other comprehensive (loss)/income 138         132 132 6  
Other comprehensive income, redeemable [2]                 2
Other comprehensive income, total 140                
Issuance of shares under employee stock compensation plans 18   18       18    
Issue of shares under employee stock compensation plans (in shares)   181              
Share-based compensation 19   19       19    
Additional non-controlling interests (1)   (1)       (1)    
Foreign currency translation (6)   (6)       (6)    
Equity, ending balance at Jun. 30, 2017 10,387   10,658 1,402 (21) (1,776) 10,263 124  
Equity, ending balance (in shares) at Jun. 30, 2017   134,613              
Temporary equity, ending balance at Jun. 30, 2017 [2]                 57
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares repurchased (166)     (147) (19)   (166)    
Shares repurchased (in shares)   (1,116)              
Shares cancelled (177)   (177)       (177)    
Shares canceled, shares   (1,415)              
Net income (loss) (56)     (54)     (54) (2) 2 [2]
Net income (loss), total (54)                
Dividends declared (74)     (71)     (71) (3)  
Other comprehensive (loss)/income 92         100 100 (8)  
Other comprehensive income, redeemable [2]                 (4)
Other comprehensive income, total 88                
Issuance of shares under employee stock compensation plans 6   6       6    
Issue of shares under employee stock compensation plans (in shares)   201              
Share-based compensation 15   15       15    
Foreign currency translation (1)   (1)       (1)    
Equity, ending balance at Sep. 30, 2017 10,026   10,501 1,130 (40) (1,676) 9,915 111  
Equity, ending balance (in shares) at Sep. 30, 2017   132,283              
Temporary equity, ending balance at Sep. 30, 2017 [2]                 55
Equity, beginning balance at Dec. 31, 2017 10,249 [3]   10,538 [1] 1,104 (3) (1,513) 10,126 123  
Equity, beginning balance (in shares) at Dec. 31, 2017   132,140              
Temporary equity, beginning balance at Dec. 31, 2017 [2]                 28
Adoption of New Pronouncement (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017 317     317     317    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income (loss) 221     215     215 6  
Net income (loss), total 221                
Dividends declared (79)     (79)     (79)    
Other comprehensive (loss)/income 84         83 83 1  
Other comprehensive income, total 84                
Issuance of shares under employee stock compensation plans 11   11       11    
Issue of shares under employee stock compensation plans (in shares)   277              
Share-based compensation 3   3       3    
Foreign currency translation (4)   (4)       (4)    
Equity, ending balance at Mar. 31, 2018 10,802   10,548 1,557 (3) (1,430) 10,672 130  
Equity, ending balance (in shares) at Mar. 31, 2018   132,417              
Temporary equity, ending balance at Mar. 31, 2018 [2]                 28
Equity, beginning balance at Dec. 31, 2017 10,249 [3]   10,538 [1] 1,104 (3) (1,513) 10,126 123  
Equity, beginning balance (in shares) at Dec. 31, 2017   132,140              
Temporary equity, beginning balance at Dec. 31, 2017 [2]                 28
Adoption of New Pronouncement (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017 317     317     317    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income (loss), total 332                
Equity, ending balance at Sep. 30, 2018 10,163 [3]   10,577 1,102 (3) (1,627) 10,049 114  
Equity, ending balance (in shares) at Sep. 30, 2018   129,913              
Temporary equity, ending balance at Sep. 30, 2018 [2]                 27
Equity, beginning balance at Mar. 31, 2018 10,802   10,548 1,557 (3) (1,430) 10,672 130  
Equity, beginning balance (in shares) at Mar. 31, 2018   132,417              
Temporary equity, beginning balance at Mar. 31, 2018 [2]                 28
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares repurchased (269)     (269)     (269)    
Shares repurchased (in shares)   (1,768)              
Net income (loss) 63     58     58 5  
Net income, redeemable [2]                 2
Net income (loss), total 65                
Dividends declared (92)     (76)     (76) (16) (2) [2]
Other comprehensive (loss)/income (175)         (175) (175)    
Other comprehensive income, redeemable [2]                 (1)
Other comprehensive income, total (176)                
Issuance of shares under employee stock compensation plans 7   7       7    
Issue of shares under employee stock compensation plans (in shares)   81              
Share-based compensation 1   1       1    
Foreign currency translation 10   10       10    
Equity, ending balance at Jun. 30, 2018 10,347   10,566 1,270 (3) (1,605) 10,228 119  
Equity, ending balance (in shares) at Jun. 30, 2018   130,730              
Temporary equity, ending balance at Jun. 30, 2018 [2]                 27
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares repurchased (132)     (132)     (132)    
Shares repurchased (in shares)   (890)              
Net income (loss) 45     44     44 1  
Net income, redeemable [2]                 1
Net income (loss), total 46                
Dividends declared (86)     (80)     (80) (6) (1) [2]
Other comprehensive (loss)/income (22)         (22) (22)    
Other comprehensive income, total (22)                
Issuance of shares under employee stock compensation plans 3   3       3    
Issue of shares under employee stock compensation plans (in shares)   73              
Share-based compensation 11   11       11    
Foreign currency translation (3)   (3)       (3)    
Equity, ending balance at Sep. 30, 2018 $ 10,163 [3]   $ 10,577 $ 1,102 $ (3) $ (1,627) $ 10,049 $ 114  
Equity, ending balance (in shares) at Sep. 30, 2018   129,913              
Temporary equity, ending balance at Sep. 30, 2018 [2]                 $ 27
[1] Accumulated other comprehensive loss, net of tax (‘AOCL’).
[2] The non-controlling interest is related to Max Matthiessen Holding AB.
[3] Equity includes (a) Ordinary shares $0.000304635 nominal value; Authorized 1,510,003,775; Issued 129,912,918 (2018) and 132,139,581 (2017); Outstanding 129,912,918 (2018) and 132,139,581 (2017); (b) Ordinary shares, €1 nominal value; Authorized and Issued 40,000 shares in 2018 and 2017; and (c) Preference shares, $0.000115 nominal value; Authorized 1,000,000,000 and Issued none in 2018 and 2017.