v3.22.0.1
Unsecured Borrowings - Subordinated Borrowings (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total subordinated Borrowings, par amount $ 13,405 $ 15,104
Total subordinated Borrowings $ 16,892 $ 19,959
Effective weighted average interest rate on subordinated borrowings, after hedging 1.71% 1.80%
Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Subordinated debt, par amount $ 12,437 $ 14,136
Subordinated debt outstanding $ 15,571 $ 18,529
Effective weighted average interest rate of subordinated debt after hedging 1.74% 1.83%
Junior Subordinated Debt [Member]    
Debt Instrument [Line Items]    
Subordinated debt, par amount $ 968 $ 968
Junior subordinated debt $ 1,321 $ 1,430
Effective weighted average interest rate of junior subordinated debt, after hedging 1.31% 1.32%