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Loans - Fair Value of Loans Held for Investment by Level (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value $ 8,250 $ 10,769
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 6,192 8,415
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 2,058 2,354
Corporate    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 1,844 2,492
Corporate | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 0 0
Corporate | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 1,101 1,655
Corporate | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 743 837
Wealth management    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 4,537 5,936
Wealth management | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 0 0
Wealth management | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 4,474 5,873
Wealth management | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 63 63
Commercial real estate    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 1,277 1,588
Commercial real estate | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 0 0
Commercial real estate | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 432 605
Commercial real estate | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 845 983
Residential real estate    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 257 320
Residential real estate | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 0 0
Residential real estate | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 162 115
Residential real estate | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 95 205
Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 335 433
Other | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 0 0
Other | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value 23 167
Other | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total loans, gross, Fair Value $ 312 $ 266