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Derivative Financial Instruments - Notional Amounts and Fair Values for All Derivative Instruments Included in the Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Derivatives, Fair Value    
Derivative Assets $ 2,933 $ 3,173
Derivative Liabilities 3,424 3,952
Amount of variation margin payment applied to derivative asset contracts 908 1,000
Amount of variation margin payment applied to derivative liability contracts 1,400 1,000
Designated as Hedging Instrument | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges    
Derivatives, Fair Value    
Derivative Assets 6 157
Derivative Liabilities 66 296
Designated as Hedging Instrument | Fair Value Hedging | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges    
Derivatives, Fair Value    
Derivative Assets 0 126
Derivative Liabilities 39 195
Designated as Hedging Instrument | Fair Value Hedging | Interest rate swap | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Long-term debt    
Derivatives, Fair Value    
Notional Amount 5,955 5,955
Derivative Assets 0 126
Derivative Liabilities 39 195
Designated as Hedging Instrument | Cash Flow Hedging    
Derivatives, Fair Value    
Notional Amount 12,500  
Designated as Hedging Instrument | Cash Flow Hedging | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges    
Derivatives, Fair Value    
Derivative Assets 6 31
Derivative Liabilities 27 101
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Commercial and industrial    
Derivatives, Fair Value    
Notional Amount 9,000 8,000
Derivative Assets 2 0
Derivative Liabilities 10 76
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Commercial mortgage and commercial construction    
Derivatives, Fair Value    
Notional Amount 4,000 4,000
Derivative Assets 0 0
Derivative Liabilities 11 25
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate floor | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Commercial and industrial    
Derivatives, Fair Value    
Notional Amount 3,000 3,000
Derivative Assets 3 4
Derivative Liabilities 0 0
Designated as Hedging Instrument | Cash Flow Hedging | Forward starting interest rate swap | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Commercial and industrial    
Derivatives, Fair Value    
Notional Amount 17,500 11,000
Derivative Assets 0 22
Derivative Liabilities 3 0
Designated as Hedging Instrument | Cash Flow Hedging | Forward starting interest rate swap | Accumulated Net Gain (Loss) from Designated or Qualifying Hedges | Commercial mortgage and commercial construction    
Derivatives, Fair Value    
Notional Amount 8,000 4,000
Derivative Assets 1 5
Derivative Liabilities 3 0
Not Designated as Hedging Instrument    
Derivatives, Fair Value    
Derivative Assets 2,927 3,016
Derivative Liabilities 3,358 3,656
Not Designated as Hedging Instrument | Interest rate contracts for collateral management    
Derivatives, Fair Value    
Notional Amount 18,000  
Not Designated as Hedging Instrument | Interest rate contracts for LIBOR transition    
Derivatives, Fair Value    
Notional Amount 18,000  
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes    
Derivatives, Fair Value    
Derivative Assets 65 85
Derivative Liabilities 230 220
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Interest rate contracts related to MSR portfolio    
Derivatives, Fair Value    
Notional Amount 4,350 2,975
Derivative Assets 49 62
Derivative Liabilities 12 17
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Forward contracts related to residential mortgage loans held for sale | Loans held for sale    
Derivatives, Fair Value    
Notional Amount 1,002 1,869
Derivative Assets 5 9
Derivative Liabilities 0 7
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Swap    
Derivatives, Fair Value    
Notional Amount 3,817 3,358
Derivative Assets 0 0
Derivative Liabilities 204 195
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Foreign exchange contracts    
Derivatives, Fair Value    
Notional Amount 178 156
Derivative Assets 0 1
Derivative Liabilities 3 0
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Interest-only strips    
Derivatives, Fair Value    
Notional Amount 45 58
Derivative Assets 1 4
Derivative Liabilities 0 0
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Interest rate contracts for collateral management    
Derivatives, Fair Value    
Notional Amount 30,000 12,000
Derivative Assets 10 9
Derivative Liabilities 11 1
Not Designated as Hedging Instrument | Risk Management and Other Business Purposes | Interest rate contracts for LIBOR transition    
Derivatives, Fair Value    
Notional Amount 597 597
Derivative Assets 0 0
Derivative Liabilities 0 0
Not Designated as Hedging Instrument | Customer Accommodation    
Derivatives, Fair Value    
Derivative Assets 2,862 2,931
Derivative Liabilities 3,128 3,436
Not Designated as Hedging Instrument | Customer Accommodation | Foreign exchange contracts    
Derivatives, Fair Value    
Notional Amount 29,323 25,322
Derivative Assets 561 453
Derivative Liabilities 515 422
Not Designated as Hedging Instrument | Customer Accommodation | Interest rate contracts    
Derivatives, Fair Value    
Notional Amount 114,891 83,605
Derivative Assets 1,272 998
Derivative Liabilities 1,675 1,663
Amount of variation margin payment applied to derivative asset contracts 564 694
Amount of variation margin payment applied to derivative liability contracts 172 37
Not Designated as Hedging Instrument | Customer Accommodation | Interest rate lock commitments    
Derivatives, Fair Value    
Notional Amount 457 216
Derivative Assets 8 2
Derivative Liabilities 0 1
Not Designated as Hedging Instrument | Customer Accommodation | Commodity contracts    
Derivatives, Fair Value    
Notional Amount 17,381 16,122
Derivative Assets 1,021 1,478
Derivative Liabilities 938 1,350
Not Designated as Hedging Instrument | Customer Accommodation | TBA securities    
Derivatives, Fair Value    
Notional Amount 54 62
Derivative Assets 0 0
Derivative Liabilities $ 0 $ 0