v3.21.2
Loans - Summary of Weighted Average of Significant Unobservable Inputs (Detail)
$ in Millions
Sep. 30, 2021
USD ($)
yr
Dec. 31, 2020
USD ($)
yr
Loans receivable at fair value | $ $ 12,104 $ 13,625
Level 3 [Member]    
Loans receivable at fair value | $ 2,199 2,678
Corporate [Member]    
Loans receivable at fair value | $ 3,020 2,751
Corporate [Member] | Level 3 [Member]    
Loans receivable at fair value | $ 775 929
Commercial real estate [Member]    
Loans receivable at fair value | $ 1,655 1,961
Commercial real estate [Member] | Level 3 [Member]    
Loans receivable at fair value | $ 936 1,104
Residential real estate [Member]    
Loans receivable at fair value | $ 351 494
Residential real estate [Member] | Level 3 [Member]    
Loans receivable at fair value | $ 166 260
Wealth management and other [Member] | Level 3 [Member]    
Loans receivable at fair value | $ $ 322 $ 385
Minimum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.023 0.011
Minimum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.070 0.045
Minimum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.020 0.020
Minimum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Wealth management and other [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.035 0.028
Minimum [Member] | Fair Value Unobservable Inputs, Recovery Rate [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.200 0.150
Minimum [Member] | Fair Value Unobservable Inputs, Recovery Rate [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.025 0.030
Minimum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 1.7 1.5
Minimum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.2 0.3
Minimum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.4 0.6
Minimum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Wealth management and other [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 3.1 0.9
Maximum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.403 0.452
Maximum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.254 0.193
Maximum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.135 0.140
Maximum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Wealth management and other [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.187 0.187
Maximum [Member] | Fair Value Unobservable Inputs, Recovery Rate [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.944 0.580
Maximum [Member] | Fair Value Unobservable Inputs, Recovery Rate [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.995 0.998
Maximum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 4.5 5.3
Maximum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 4.1 4.8
Maximum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 2.4 2.6
Maximum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Wealth management and other [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 5.7 5.5
Weighted Average [Member] | Fair Value Unobservable Inputs, Yield [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.089 0.124
Weighted Average [Member] | Fair Value Unobservable Inputs, Yield [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.144 0.110
Weighted Average [Member] | Fair Value Unobservable Inputs, Yield [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.110 0.121
Weighted Average [Member] | Fair Value Unobservable Inputs, Yield [Member] | Wealth management and other [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.079 0.080
Weighted Average [Member] | Fair Value Unobservable Inputs, Recovery Rate [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.560 0.310
Weighted Average [Member] | Fair Value Unobservable Inputs, Recovery Rate [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.396 0.665
Weighted Average [Member] | Fair Value Unobservable Inputs, Duration [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 3.2 3.4
Weighted Average [Member] | Fair Value Unobservable Inputs, Duration [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 1.4 2.6
Weighted Average [Member] | Fair Value Unobservable Inputs, Duration [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.9 1.7
Weighted Average [Member] | Fair Value Unobservable Inputs, Duration [Member] | Wealth management and other [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 4.0 4.1