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Goodwill and Intangible Assets - Gross Amortizable Intangible Assets by Type (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Amortizable Intangible Assets    
Non-amortizable assets - gross carrying amount $ 2,120 $ 0
Amortizable assets - gross carrying amount 10,059 8,245
Accumulated Amortization 3,819 3,265
Estimated annual amortization expense for the next five years 530  
Management contracts    
Amortizable Intangible Assets    
Non-amortizable assets - gross carrying amount 2,120 0
Amortizable assets - gross carrying amount 291 178
Accumulated Amortization 95 120
Customer relationships    
Amortizable Intangible Assets    
Non-amortizable assets - gross carrying amount 0 0
Amortizable assets - gross carrying amount 8,851 7,420
Accumulated Amortization 3,515 2,984
Tradenames    
Amortizable Intangible Assets    
Non-amortizable assets - gross carrying amount 0 0
Amortizable assets - gross carrying amount 737 460
Accumulated Amortization 117 82
Other    
Amortizable Intangible Assets    
Non-amortizable assets - gross carrying amount 0 0
Amortizable assets - gross carrying amount 180 187
Accumulated Amortization $ 92 $ 79