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Segment Information Segment Information (Asset Management and Service Fees) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Asset management and service fees $ 1,176 $ 1,033
Asset-based management fees    
Asset management and service fees 994 875
Performance-based incentive fees    
Asset management and service fees 27 14
Other fees    
Asset management and service fees $ 155 $ 144