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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Finite-lived Intangible Assets [Roll Forward]          
Finite-lived intangible assets, gross carrying amount $ 5,039   $ 5,039   $ 4,901
Finite-lived intangible assets, accumulated amortization (3,807)   (3,807)   (3,606)
Finite-lived intangible assets, net amount 1,232   1,232   1,295
Intangible assets acquired     10    
Amortization (49) $ (60) (97) $ (120)  
Foreign exchange     24    
Software [Member]          
Finite-lived Intangible Assets [Roll Forward]          
Finite-lived intangible assets, gross carrying amount 752   752   730
Finite-lived intangible assets, accumulated amortization (750)   (750)   (727)
Finite-lived intangible assets, net amount 2   2   3
Intangible assets acquired     0    
Amortization     (1)    
Foreign exchange     0    
Client relationships [Member]          
Finite-lived Intangible Assets [Roll Forward]          
Finite-lived intangible assets, gross carrying amount 3,246   3,246   3,135
Finite-lived intangible assets, accumulated amortization (2,649)   (2,649)   (2,497)
Finite-lived intangible assets, net amount 597   597   638
Intangible assets acquired     10    
Amortization     (75)    
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 (408)   (408)   (382)
Finite-lived intangible assets, net amount $ 633   633   $ 654
Intangible assets acquired     0    
Amortization     (21)    
Foreign exchange     $ 0