v3.19.3.a.u2
Intangible Assets - Finite-lived Intangible Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets - Remaining Weighted-Average Estimated Useful Life 7 years 9 months 18 days 6 years 6 months
Finite-lived intangible assets - Gross Carrying Amount $ 976 $ 505
Finite-lived intangible assets - Accumulated Amortization 185 244
Total $ 791 $ 261
Management Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets - Remaining Weighted-Average Estimated Useful Life 4 years 9 months 18 days 5 years 2 months 12 days
Finite-lived intangible assets - Gross Carrying Amount $ 283 $ 439
Finite-lived intangible assets - Accumulated Amortization 135 237
Total $ 148 $ 202
Investor/Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets - Remaining Weighted-Average Estimated Useful Life 9 years 2 months 12 days 10 years 8 months 12 days
Finite-lived intangible assets - Gross Carrying Amount $ 476 $ 66
Finite-lived intangible assets - Accumulated Amortization 39 7
Total $ 437 $ 59
Technology-Related [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets - Remaining Weighted-Average Estimated Useful Life 7 years 4 months 24 days  
Finite-lived intangible assets - Gross Carrying Amount $ 203  
Finite-lived intangible assets - Accumulated Amortization 9  
Total $ 194  
Trade Names / Trademarks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets - Remaining Weighted-Average Estimated Useful Life 3 years 3 months 18 days  
Finite-lived intangible assets - Gross Carrying Amount $ 14  
Finite-lived intangible assets - Accumulated Amortization 2  
Total $ 12