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Fair Value Measurement - Level 3 Inputs (Details)
$ in Millions
Mar. 31, 2024
USD ($)
$ / shares
$ / bbl
$ / MMBTU
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans $ 39,046 $ 38,851    
MSRs 8,605 8,522 $ 7,755 $ 7,973
Equity securities for which quoted prices are not readily available $ 4,467 4,500 $ 3,910  
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 0.12      
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 0.0025      
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 0.0420      
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 0.0116      
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 0.20      
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 (0.82)      
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 0.90      
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 0.19      
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 0.24      
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 0.68      
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 0.46      
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 0.2501      
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 0.0080      
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 0.60      
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 0.39      
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 0.01      
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 1.34      
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 0.26      
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 0.01      
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 0.57      
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 (0.88)      
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 (0.31)      
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 (0.40)      
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 0.25      
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 0.03      
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 0.68      
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 0.12      
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 0.06      
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 0.03      
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 80      
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 243      
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 100      
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 111      
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 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 108      
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 92      
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 0.20      
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 0.06      
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 0.0025      
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 0.0420      
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 0.0116      
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 0.0064      
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 0.20      
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 (0.82)      
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 0.90      
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 0.19      
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 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 | Net 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 | Net 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 72      
Level 3 | Net 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 0.24      
Level 3 | Net 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 0.68      
Level 3 | Net 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 0.46      
Level 3 | Net 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 | Net 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 | Net 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 0.0263      
Level 3 | Net 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 | Net 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 | Net 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 0.49      
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 0.22      
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 0.17      
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 0.07      
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 0.76      
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 1.52      
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 1.37      
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 0.01      
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 0.57      
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 (0.88)      
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 (0.31)      
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 (0.40)      
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 0.25      
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 0.03      
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 91      
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 277      
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 184      
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 0      
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 9      
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 5      
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 0.15      
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 0.24      
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 0.19      
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 0.96      
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 0.31      
Recurring        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans $ 39,046 38,851    
MSRs 8,605 8,522    
Long-term debt, short-term borrowings, and deposits 697,963 541,419    
Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans 2,901 3,079    
MSRs 8,605 8,522    
Long-term debt, short-term borrowings, and deposits 45,280 $ 42,182    
Other level 3 asset and liabilities, net 1,059      
Equity securities for which quoted prices are not readily available 783      
Recurring | Level 3 | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
MSRs 8,605      
Long-term debt, short-term borrowings, and deposits 1,205      
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 31,734      
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 1,599      
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 1,387      
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 570      
Recurring | Level 3 | Loans | Market comparables        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans 1,195      
Recurring | Level 3 | Trading loans | Market comparables        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans 466      
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 | Nontrading 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 862      
Recurring | Level 3 | Nontrading loans | Market comparables        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans 729      
Recurring | Level 3 | Nontrading 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 1,300      
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) 2      
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) 798      
Recurring | Level 3 | Net credit derivatives | Discounted cash flows        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivative asset (liability) 230      
Recurring | Level 3 | Net credit derivatives | Market comparables        
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Net derivative asset (liability) 30      
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) (59)      
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) 83      
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) (2,781)      
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) (503)      
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 729      
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 8      
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 12      
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 $ 580