v3.21.2
Commitments, Contingencies and Guarantees - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Summary Of Commitments And Contingent Liabilities [Line Items]              
Lending commitments $ 214,532 $ 214,532 $ 171,575        
Commitments to invest in funds managed by the firm 1,790 1,790 1,690        
Lending Commitments Allowance 833 833 557 $ 822 $ 615 $ 490 $ 313
Estimated fair value of lending commitments liabilities 4,020 4,020 4,050        
Lending commitments 198,358 198,358 162,513        
NN Investment Partners [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Investment Company, Committed Capital   1,900          
Investment Company, Net Assets, Period Increase (Decrease)   320,000          
GreenSky, Inc [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Lending commitments 800 800          
Investment Company, Committed Capital   $ 2,000          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares   0.03          
Additional Amount Of Lending Commitments 1,000 $ 1,000          
Credit Card Receivables Issued To Customers [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Lending commitments 29,790 29,790 21,640        
Credit cards [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
CommitmentGM 2,000 2,000          
Securities Lending Indemnification [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Collateral held by lenders in connection with securities lending indemnifications 12,870 12,870 20,390        
Maximum Payout/Notional Amount by Period of Expiration 12,480 12,480 19,860        
Fixed Income Clearing Corporation Guarantees [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Maximum Payout/Notional Amount by Period of Expiration     1,490        
Maximum exposure on collateral held     1,500        
Amortized cost [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Carrying value of lending commitments liabilities 1,070 1,070 775        
Lending Commitments Allowance 833 833 557        
Amortized cost [Member] | Level 2 [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Estimated fair value of lending commitments liabilities 2,130 2,130 2,430        
Amortized cost [Member] | Level 3 [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Estimated fair value of lending commitments liabilities 1,890 1,890 1,620        
Held for sale [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Carrying value of lending commitments liabilities 112 112 68        
Investment Grade Commercial Lending, Relationship Lending Activities [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Lending commitments 119,800 119,800 110,310        
Investment Grade Commercial Lending, Other Investment Banking Activities Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Lending commitments 32,430 $ 32,430 15,810        
GS Malaysia Development Berhad [Member] | Guarantee Obligations [Member]              
Summary Of Commitments And Contingent Liabilities [Line Items]              
Agreement in principle to extend a guarantee related to legal and regulatory proceedings 1,400            
Repayments for other financial guarantees $ 450   $ 1,400