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Fair Value Measurement - Level 3 Inputs (Details)
$ in Millions
Sep. 30, 2024
USD ($)
$ / shares
$ / bbl
$ / MMBTU
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Loans $ 42,137   $ 38,851      
MSRs 8,753 $ 8,847 8,522 $ 9,109 $ 8,229 $ 7,973
Equity securities for which quoted prices are not readily available $ 3,660   4,500 $ 4,499    
Assumed par value for price input (in dollars per share) | $ / shares $ 100          
Level 3 | Yield | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.05          
Level 3 | Yield | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.20          
Level 3 | Yield | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.10          
Level 3 | Loss severity | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0          
Level 3 | Loss severity | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 1          
Level 3 | Loss severity | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.50          
Level 3 | Interest rate volatility | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.0007          
Level 3 | Interest rate volatility | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.0555          
Level 3 | Interest rate volatility | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.0111          
Level 3 | Bermudan switch value | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0          
Level 3 | Bermudan switch value | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.52          
Level 3 | Bermudan switch value | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.17          
Level 3 | Interest rate correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs (0.85)          
Level 3 | Interest rate correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.97          
Level 3 | Interest rate correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.63          
Level 3 | IR-FX correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs (0.35)          
Level 3 | IR-FX correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.60          
Level 3 | IR-FX correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.05          
Level 3 | Credit correlation | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.30          
Level 3 | Credit correlation | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.69          
Level 3 | Credit correlation | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.48          
Level 3 | Credit spread | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.0001          
Level 3 | Credit spread | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.0270          
Level 3 | Credit spread | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.0081          
Level 3 | Recovery rate | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.20          
Level 3 | Recovery rate | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.40          
Level 3 | Recovery rate | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.37          
Level 3 | Equity volatility | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.02          
Level 3 | Equity volatility | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 1.40          
Level 3 | Equity volatility | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.28          
Level 3 | Equity correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.17          
Level 3 | Equity correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 1          
Level 3 | Equity correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.56          
Level 3 | Equity-FX correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs (0.80)          
Level 3 | Equity-FX correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.65          
Level 3 | Equity-FX correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs (0.32)          
Level 3 | Equity-IR correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.10          
Level 3 | Equity-IR correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.18          
Level 3 | Equity-IR correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits, measurement inputs 0.14          
Level 3 | Residential mortgage-backed securities and loans | Yield | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0          
Level 3 | Residential mortgage-backed securities and loans | Yield | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0.89          
Level 3 | Residential mortgage-backed securities and loans | Yield | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0.07          
Level 3 | Residential mortgage-backed securities and loans | Prepayment speed | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0.03          
Level 3 | Residential mortgage-backed securities and loans | Prepayment speed | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0.14          
Level 3 | Residential mortgage-backed securities and loans | Prepayment speed | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0.08          
Level 3 | Residential mortgage-backed securities and loans | Conditional default rate | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0          
Level 3 | Residential mortgage-backed securities and loans | Conditional default rate | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0.06          
Level 3 | Residential mortgage-backed securities and loans | Conditional default rate | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0          
Level 3 | Residential mortgage-backed securities and loans | Loss severity | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0          
Level 3 | Residential mortgage-backed securities and loans | Loss severity | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 1.10          
Level 3 | Residential mortgage-backed securities and loans | Loss severity | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input 0.05          
Level 3 | Commercial mortgage-backed securities and loans | Price (in USD/share) | Market comparables | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input | $ / shares 0          
Level 3 | Commercial mortgage-backed securities and loans | Price (in USD/share) | Market comparables | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input | $ / shares 90          
Level 3 | Commercial mortgage-backed securities and loans | Price (in USD/share) | Market comparables | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans, measurement input | $ / shares 82          
Level 3 | Corporate debt securities | Price (in USD/share) | Market comparables | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities, trading, measurement input | $ / shares 0          
Level 3 | Corporate debt securities | Price (in USD/share) | Market comparables | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities, trading, measurement input | $ / shares 175          
Level 3 | Corporate debt securities | Price (in USD/share) | Market comparables | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities, trading, measurement input | $ / shares 85          
Level 3 | Loans | Price (in USD/share) | Market comparables | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Loans, measurement input | $ / shares 0          
Level 3 | Loans | Price (in USD/share) | Market comparables | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Loans, measurement input | $ / shares 115          
Level 3 | Loans | Price (in USD/share) | Market comparables | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Loans, measurement input | $ / shares 80          
Level 3 | Non-U.S. government debt | Price (in USD/share) | Market comparables | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities, trading, measurement input | $ / shares 0          
Level 3 | Non-U.S. government debt | Price (in USD/share) | Market comparables | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities, trading, measurement input | $ / shares 104          
Level 3 | Non-U.S. government debt | Price (in USD/share) | Market comparables | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities, trading, measurement input | $ / shares 96          
Level 3 | Net interest rate derivatives | Prepayment speed | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0          
Level 3 | Net interest rate derivatives | Prepayment speed | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.21          
Level 3 | Net interest rate derivatives | Prepayment speed | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.07          
Level 3 | Net interest rate derivatives | Interest rate volatility | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.0007          
Level 3 | Net interest rate derivatives | Interest rate volatility | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.0555          
Level 3 | Net interest rate derivatives | Interest rate volatility | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.0111          
Level 3 | Net interest rate derivatives | Interest rate spread volatility | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.0037          
Level 3 | Net interest rate derivatives | Interest rate spread volatility | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.0077          
Level 3 | Net interest rate derivatives | Interest rate spread volatility | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.0065          
Level 3 | Net interest rate derivatives | Bermudan switch value | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0          
Level 3 | Net interest rate derivatives | Bermudan switch value | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.52          
Level 3 | Net interest rate derivatives | Bermudan switch value | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.17          
Level 3 | Net interest rate derivatives | Interest rate correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs (0.85)          
Level 3 | Net interest rate derivatives | Interest rate correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.97          
Level 3 | Net interest rate derivatives | Interest rate correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.63          
Level 3 | Net interest rate derivatives | IR-FX correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs (0.35)          
Level 3 | Net interest rate derivatives | IR-FX correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.60          
Level 3 | Net interest rate derivatives | IR-FX correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.05          
Level 3 | Credit derivatives | Price (in USD/share) | Market comparables | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs | $ / shares 0          
Level 3 | Credit derivatives | Price (in USD/share) | Market comparables | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs | $ / shares 115          
Level 3 | Credit derivatives | Price (in USD/share) | Market comparables | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs | $ / shares 73          
Level 3 | Credit derivatives | Credit correlation | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.30          
Level 3 | Credit derivatives | Credit correlation | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.69          
Level 3 | Credit derivatives | Credit correlation | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.48          
Level 3 | Credit derivatives | Credit spread | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0          
Level 3 | Credit derivatives | Credit spread | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.2999          
Level 3 | Credit derivatives | Credit spread | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.0341          
Level 3 | Credit derivatives | Recovery rate | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.10          
Level 3 | Credit derivatives | Recovery rate | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.90          
Level 3 | Credit derivatives | Recovery rate | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.57          
Level 3 | Net foreign exchange derivatives | Prepayment speed | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.11          
Level 3 | Net foreign exchange derivatives | Prepayment speed | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.11          
Level 3 | Net foreign exchange derivatives | Prepayment speed | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.11          
Level 3 | Net foreign exchange derivatives | IR-FX correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs (0.40)          
Level 3 | Net foreign exchange derivatives | IR-FX correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.60          
Level 3 | Net foreign exchange derivatives | IR-FX correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.21          
Level 3 | Net foreign exchange derivatives | Interest rate curve | Discounted cash flows | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.02          
Level 3 | Net foreign exchange derivatives | Interest rate curve | Discounted cash flows | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.49          
Level 3 | Net foreign exchange derivatives | Interest rate curve | Discounted cash flows | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.08          
Level 3 | Net equity derivatives | Forward equity price | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.80          
Level 3 | Net equity derivatives | Forward equity price | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 1.44          
Level 3 | Net equity derivatives | Forward equity price | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 1.01          
Level 3 | Net equity derivatives | Equity volatility | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.04          
Level 3 | Net equity derivatives | Equity volatility | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 1.43          
Level 3 | Net equity derivatives | Equity volatility | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.32          
Level 3 | Net equity derivatives | Equity correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.17          
Level 3 | Net equity derivatives | Equity correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 1          
Level 3 | Net equity derivatives | Equity correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.56          
Level 3 | Net equity derivatives | Equity-FX correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs (0.80)          
Level 3 | Net equity derivatives | Equity-FX correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.65          
Level 3 | Net equity derivatives | Equity-FX correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs (0.32)          
Level 3 | Net equity derivatives | Equity-IR correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.10          
Level 3 | Net equity derivatives | Equity-IR correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.18          
Level 3 | Net equity derivatives | Equity-IR correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.14          
Level 3 | Net commodity derivatives | Oil commodity forward (in USD/ BBL) | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs | $ / bbl 82          
Level 3 | Net commodity derivatives | Oil commodity forward (in USD/ BBL) | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs | $ / bbl 266          
Level 3 | Net commodity derivatives | Oil commodity forward (in USD/ BBL) | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs | $ / bbl 150          
Level 3 | Net commodity derivatives | Natural gas commodity forward (in USD/ MMBTU) | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs | $ / MMBTU 1          
Level 3 | Net commodity derivatives | Natural gas commodity forward (in USD/ MMBTU) | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs | $ / MMBTU 7          
Level 3 | Net commodity derivatives | Natural gas commodity forward (in USD/ MMBTU) | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs | $ / MMBTU 3          
Level 3 | Net commodity derivatives | Commodity volatility | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.02          
Level 3 | Net commodity derivatives | Commodity volatility | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.47          
Level 3 | Net commodity derivatives | Commodity volatility | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.05          
Level 3 | Net commodity derivatives | Commodity correlation | Option pricing | Minimum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs (0.35)          
Level 3 | Net commodity derivatives | Commodity correlation | Option pricing | Maximum            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs 0.98          
Level 3 | Net commodity derivatives | Commodity correlation | Option pricing | Average            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability), measurement inputs (0.08)          
Recurring            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Loans $ 42,137   38,851      
MSRs 8,753   8,522      
Long-term debt, short-term borrowings, and deposits 751,250   541,419      
Recurring | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Loans 2,487   3,079      
MSRs 8,753   8,522      
Long-term debt, short-term borrowings, and deposits 51,575   $ 42,182      
Other level 3 asset and liabilities, net 1,375          
Equity securities for which quoted prices are not readily available 737          
Recurring | Level 3 | Discounted cash flows            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
MSRs 8,753          
Long-term debt, short-term borrowings, and deposits 894          
Recurring | Level 3 | Option pricing            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Long-term debt, short-term borrowings, and deposits 38,445          
Recurring | Level 3 | Residential mortgage-backed securities and loans | Discounted cash flows            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans 1,078          
Recurring | Level 3 | Commercial mortgage-backed securities and loans | Market comparables            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans 1,495          
Recurring | Level 3 | Corporate debt securities | Market comparables            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities, trading 435          
Recurring | Level 3 | Loans | Market comparables            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Loans 1,440          
Recurring | Level 3 | Trading loans | Market comparables            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Loans 754          
Recurring | Level 3 | Trading loans | Market comparables | Commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans 65          
Recurring | Level 3 | Non-trading loans | Discounted cash flows | Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans 382          
Recurring | Level 3 | Non-trading loans | Market comparables            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Loans 686          
Recurring | Level 3 | Non-trading loans | Market comparables | Commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans 1,400          
Recurring | Level 3 | Non-U.S. government debt | Market comparables            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities, trading 173          
Recurring | Level 3 | Net interest rate derivatives | Discounted cash flows            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability) 8          
Recurring | Level 3 | Net interest rate derivatives | Option pricing            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability) 2,821          
Recurring | Level 3 | Credit derivatives | Discounted cash flows            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability) (130)          
Recurring | Level 3 | Credit derivatives | Market comparables            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability) 31          
Recurring | Level 3 | Net foreign exchange derivatives | Discounted cash flows            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability) (49)          
Recurring | Level 3 | Net foreign exchange derivatives | Option pricing            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability) 89          
Recurring | Level 3 | Net equity derivatives | Option pricing            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability) (3,810)          
Recurring | Level 3 | Net commodity derivatives | Option pricing            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Net derivative asset (liability) (372)          
Recurring | Level 3 | Mortgage-backed securities, U.S. GSEs and government agencies | Discounted cash flows | Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans 691          
Recurring | Level 3 | Residential mortgage-backed securities | Discounted cash flows | Residential mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans 5          
Recurring | Level 3 | Commercial mortgage-backed securities | Market comparables | Commercial mortgage-backed securities            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Debt securities and loans 11          
Recurring | Level 3 | Other assets            
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Equity securities for which quoted prices are not readily available $ 636