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Goodwill and Other Intangible Assets - Changes in the Net Carrying Amount of the Components of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Finite-lived Intangible Assets [Roll Forward]          
Finite-lived intangible assets, gross carrying amount $ 5,028   $ 5,028   $ 4,901
Finite-lived intangible assets, accumulated amortization (3,843)   (3,843)   (3,606)
Finite-lived intangible assets, net amount 1,185   1,185   1,295
Intangible assets acquired     10    
Amortization (47) $ (56) (144) $ (176)  
Foreign exchange     24    
Software [Member]          
Finite-lived Intangible Assets [Roll Forward]          
Finite-lived intangible assets, gross carrying amount 750   750   730
Finite-lived intangible assets, accumulated amortization (749)   (749)   (727)
Finite-lived intangible assets, net amount 1   1   3
Intangible assets acquired     0    
Amortization     (2)    
Foreign exchange     0    
Client relationships [Member]          
Finite-lived Intangible Assets [Roll Forward]          
Finite-lived intangible assets, gross carrying amount 3,237   3,237   3,135
Finite-lived intangible assets, accumulated amortization (2,675)   (2,675)   (2,497)
Finite-lived intangible assets, net amount 562   562   638
Intangible assets acquired     10    
Amortization     (110)    
Foreign exchange     24    
Trademark and trade name [Member]          
Finite-lived Intangible Assets [Roll Forward]          
Finite-lived intangible assets, gross carrying amount 1,041   1,041   1,036
Finite-lived intangible assets, accumulated amortization (419)   (419)   (382)
Finite-lived intangible assets, net amount $ 622   622   $ 654
Intangible assets acquired     0    
Amortization     (32)    
Foreign exchange     $ 0