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Fair Value Measurement - Level 3 Inputs (Details)
$ in Millions
Mar. 31, 2026
USD ($)
$ / shares
$ / bbl
$ / MMBTU
Dec. 31, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans $ 62,255 $ 70,684    
MSRs 9,093 9,167 $ 9,127 $ 9,121
Equity securities for which quoted prices are not readily available $ 5,797 4,900 $ 3,988  
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 0.0024      
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 0.0503      
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 0.0100      
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 (0.64)      
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 0.56      
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 0.04      
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 0.27      
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 0.76      
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 0.52      
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 0.0345      
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 0.0063      
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 0.36      
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 0.03      
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 1.17      
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 0.35      
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      
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 0.60      
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 (0.84)      
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 (0.33)      
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 0.05      
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 0.20      
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 0.13      
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 0.40      
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 0.06      
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 0.09      
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 0.03      
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      
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 0.07      
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 93      
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 81      
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 177      
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 107      
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 101      
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 83      
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 2      
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 122      
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 99      
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 0.0024      
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 0.0503      
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 0.0100      
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 0.0044      
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 0.0059      
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 0.0049      
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 (0.64)      
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 0.56      
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 0.04      
Level 3 | Net interest rate derivatives | Inflation Volatility | Option pricing | Minimum        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivative asset (liability), measurement inputs 0.0011      
Level 3 | Net interest rate derivatives | Inflation Volatility | Option pricing | Maximum        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivative asset (liability), measurement inputs 0.0174      
Level 3 | Net interest rate derivatives | Inflation Volatility | Option pricing | Average        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivative asset (liability), measurement inputs 0.0063      
Level 3 | Net interest rate 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 0.03      
Level 3 | Net interest rate 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 0.15      
Level 3 | Net interest rate 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 0.05      
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 79      
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 0.29      
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 0.79      
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 0.52      
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 0.6941      
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 0.0393      
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 0.52      
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 (0.50)      
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 0.16      
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 0.03      
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 0.18      
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 0.09      
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 0.84      
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 1.41      
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 0.02      
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 1.35      
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 0.36      
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      
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 0.54      
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 (0.78)      
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 0.71      
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 (0.33)      
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      
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 0.10      
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 0.06      
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 47      
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 1,680      
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 302      
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 6      
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 0.41      
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 0.06      
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 (0.15)      
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 0.11      
Recurring        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans $ 62,255 70,684    
MSRs 9,093 9,167    
Long-term debt, short-term borrowings, and deposits 1,072,159 770,827    
Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans 3,184 3,062    
MSRs 9,093 9,167    
Long-term debt, short-term borrowings, and deposits 69,239 $ 66,954    
Other level 3 asset and liabilities, net 1,382      
Equity securities for which quoted prices are not readily available 938      
Recurring | Level 3 | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
MSRs 9,093      
Long-term debt, short-term borrowings, and deposits 1,660      
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 54,683      
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 917      
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 1,192      
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 590      
Recurring | Level 3 | Loans | Market comparables        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans 2,399      
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 207      
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) (4)      
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) 1,733      
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) 21      
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) 39      
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) 621      
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) (3,139)      
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) 145      
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 268      
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 | Trading loans | Market comparables        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans 958      
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 93      
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 644      
Recurring | Level 3 | Non-trading loans | Market comparables        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans 1,400      
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 1,100      
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 $ 765