v3.22.0.1
Loans - Summary of Weighted Average of Significant Unobservable Inputs (Detail)
$ in Millions
Dec. 31, 2021
USD ($)
yr
Dec. 31, 2020
USD ($)
yr
Loans receivable at fair value | $ $ 10,769 $ 13,625
Level 3 [Member]    
Loans receivable at fair value | $ 2,354 2,678
Corporate [Member]    
Loans receivable at fair value | $ 2,492 2,751
Corporate [Member] | Level 3 [Member]    
Loans receivable at fair value | $ 837 929
Commercial real estate [Member]    
Loans receivable at fair value | $ 1,588 1,961
Commercial real estate [Member] | Level 3 [Member]    
Loans receivable at fair value | $ 983 1,104
Residential real estate [Member]    
Loans receivable at fair value | $ 320 494
Residential real estate [Member] | Level 3 [Member]    
Loans receivable at fair value | $ 205 260
Wealth management and other [Member] | Level 3 [Member]    
Loans receivable at fair value | $ $ 329 $ 385
Minimum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.015 0.011
Minimum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.032 0.045
Minimum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.021 0.020
Minimum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Wealth management and other [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.036 0.028
Minimum [Member] | Fair Value Unobservable Inputs, Recovery Rate [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.150 0.150
Minimum [Member] | Fair Value Unobservable Inputs, Recovery Rate [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.041 0.030
Minimum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.9 1.5
Minimum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.4 0.3
Minimum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.1 0.6
Minimum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Wealth management and other [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 2.9 0.9
Maximum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.556 0.452
Maximum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.187 0.193
Maximum [Member] | Fair Value Unobservable Inputs, Yield [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.200 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 0.920 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 6.8 5.3
Maximum [Member] | Fair Value Unobservable Inputs, Duration [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 4.0 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 5.5 5.5
Weighted Average [Member] | Fair Value Unobservable Inputs, Yield [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.149 0.124
Weighted Average [Member] | Fair Value Unobservable Inputs, Yield [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.126 0.110
Weighted Average [Member] | Fair Value Unobservable Inputs, Yield [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.161 0.121
Weighted Average [Member] | Fair Value Unobservable Inputs, Yield [Member] | Wealth management and other [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.071 0.080
Weighted Average [Member] | Fair Value Unobservable Inputs, Recovery Rate [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.408 0.310
Weighted Average [Member] | Fair Value Unobservable Inputs, Recovery Rate [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 0.414 0.665
Weighted Average [Member] | Fair Value Unobservable Inputs, Duration [Member] | Corporate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 2.7 3.4
Weighted Average [Member] | Fair Value Unobservable Inputs, Duration [Member] | Commercial real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 1.7 2.6
Weighted Average [Member] | Fair Value Unobservable Inputs, Duration [Member] | Residential real estate [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 1.0 1.7
Weighted Average [Member] | Fair Value Unobservable Inputs, Duration [Member] | Wealth management and other [Member] | Level 3 [Member]    
Loans Receivable, Measurement Input 3.6 4.1