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Acquisitions (Details) - USD ($)
$ in Millions
Jan. 01, 2021
Dec. 31, 2021
Mar. 31, 2021
Business Acquisition [Line Items]      
Goodwill   $ 629 $ 641
AXA Bank Germany      
Business Acquisition [Line Items]      
Total consideration transferred $ 101    
Business combination, recognized identifiable assets acquired and liabilities assumed, cash and equivalents 294    
Business combination, recognized identifiable assets acquired and liabilities assumed, contract with customer, liability 197    
Goodwill $ 2