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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets:      
Available-for-sale debt and other securities [1] $ 37,513 $ 36,028  
Equity securities 313 564  
Derivative assets 2,919 1,673  
Liabilities:      
FHLB, restricted stock holdings 40 76  
FRB, restricted stock holdings 482 478  
DTCC, restricted stock holdings 2 2  
Residential Mortgage Loans      
Assets:      
Portfolio loans and leases at fair value 161 183  
U.S. Treasury and federal agencies      
Assets:      
Available-for-sale debt and other securities 78 75  
Obligations of states and political subdivisions securities      
Assets:      
Available-for-sale debt and other securities 17 18  
Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt and other securities 3,176 2,206  
Fair value, recurring      
Assets:      
Available-for-sale debt and other securities 36,989 35,472  
Trading debt securities 560 297  
Equity securities 313 564  
Residential mortgage loans held for sale 1,481 1,264  
Derivative assets 2,919 1,673  
Total assets 43,079 40,446  
Liabilities:      
Derivative liabilities 1,072 741  
Short positions 455 149  
Total liabilities 1,527 890  
Fair value, recurring | Interest Rate Contract      
Assets:      
Derivative assets 2,289 1,237  
Liabilities:      
Derivative liabilities 285 157  
Fair value, recurring | Foreign Exchange Contract      
Assets:      
Derivative assets 255 165  
Liabilities:      
Derivative liabilities 227 151  
Fair value, recurring | Equity Derivatives      
Liabilities:      
Derivative liabilities 201 163  
Fair value, recurring | Commodity Contract      
Assets:      
Derivative assets 375 271  
Liabilities:      
Derivative liabilities 359 270  
Fair value, recurring | Mortgage Servicing Rights      
Assets:      
Servicing rights 656 993  
Fair value, recurring | Residential Mortgage Loans      
Assets:      
Portfolio loans and leases at fair value 161 183  
Fair value, recurring | U.S. Treasury and federal agencies      
Assets:      
Available-for-sale debt and other securities 78 75  
Trading debt securities 81 2  
Liabilities:      
Short positions 63 49  
Fair value, recurring | Obligations of states and political subdivisions securities      
Assets:      
Available-for-sale debt and other securities 17 18  
Trading debt securities 10 9  
Fair value, recurring | Agency mortgage-backed securities | Residential Mortgage Loans      
Assets:      
Available-for-sale debt and other securities 11,907 14,115  
Trading debt securities 30 55  
Fair value, recurring | Agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities 18,221 15,693  
Fair value, recurring | Non-agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities 3,590 3,365  
Fair value, recurring | Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt and other securities 3,176 2,206  
Trading debt securities 439 231  
Liabilities:      
Short positions 392 100  
Fair value, recurring | Level 1      
Assets:      
Available-for-sale debt and other securities 78 75  
Trading debt securities 81 2  
Equity securities 293 554  
Residential mortgage loans held for sale 0 0  
Derivative assets 25 38  
Total assets 477 669  
Liabilities:      
Derivative liabilities 71 22  
Short positions 63 49  
Total liabilities 134 71  
Fair value, recurring | Level 1 | Interest Rate Contract      
Assets:      
Derivative assets 1 1  
Liabilities:      
Derivative liabilities 16 5  
Fair value, recurring | Level 1 | Foreign Exchange Contract      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative liabilities 0 0  
Fair value, recurring | Level 1 | Equity Derivatives      
Liabilities:      
Derivative liabilities 0 0  
Fair value, recurring | Level 1 | Commodity Contract      
Assets:      
Derivative assets 24 37  
Liabilities:      
Derivative liabilities 55 17  
Fair value, recurring | Level 1 | Mortgage Servicing Rights      
Assets:      
Servicing rights 0 0  
Fair value, recurring | Level 1 | Residential Mortgage Loans      
Assets:      
Portfolio loans and leases at fair value 0 0  
Fair value, recurring | Level 1 | U.S. Treasury and federal agencies      
Assets:      
Available-for-sale debt and other securities 78 75  
Trading debt securities 81 2  
Liabilities:      
Short positions 63 49  
Fair value, recurring | Level 1 | Obligations of states and political subdivisions securities      
Assets:      
Available-for-sale debt and other securities 0 0  
Trading debt securities 0 0  
Fair value, recurring | Level 1 | Agency mortgage-backed securities | Residential Mortgage Loans      
Assets:      
Available-for-sale debt and other securities 0 0  
Trading debt securities 0 0  
Fair value, recurring | Level 1 | Agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities 0 0  
Fair value, recurring | Level 1 | Non-agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities 0 0  
Fair value, recurring | Level 1 | Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt and other securities 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions 0 0  
Fair value, recurring | Level 2      
Assets:      
Available-for-sale debt and other securities 36,911 35,397  
Trading debt securities 479 295  
Equity securities 20 10  
Residential mortgage loans held for sale 1,481 1,264  
Derivative assets 2,833 1,617  
Total assets 41,724 38,583  
Liabilities:      
Derivative liabilities 792 548  
Short positions 392 100  
Total liabilities 1,184 648  
Fair value, recurring | Level 2 | Interest Rate Contract      
Assets:      
Derivative assets 2,227 1,218  
Liabilities:      
Derivative liabilities 261 144  
Fair value, recurring | Level 2 | Foreign Exchange Contract      
Assets:      
Derivative assets 255 165  
Liabilities:      
Derivative liabilities 227 151  
Fair value, recurring | Level 2 | Equity Derivatives      
Liabilities:      
Derivative liabilities 0 0  
Fair value, recurring | Level 2 | Commodity Contract      
Assets:      
Derivative assets 351 234  
Liabilities:      
Derivative liabilities 304 253  
Fair value, recurring | Level 2 | Mortgage Servicing Rights      
Assets:      
Servicing rights 0 0  
Fair value, recurring | Level 2 | Residential Mortgage Loans      
Assets:      
Portfolio loans and leases at fair value 0 0  
Fair value, recurring | Level 2 | U.S. Treasury and federal agencies      
Assets:      
Available-for-sale debt and other securities 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions 0 0  
Fair value, recurring | Level 2 | Obligations of states and political subdivisions securities      
Assets:      
Available-for-sale debt and other securities 17 18  
Trading debt securities 10 9  
Fair value, recurring | Level 2 | Agency mortgage-backed securities | Residential Mortgage Loans      
Assets:      
Available-for-sale debt and other securities 11,907 14,115  
Trading debt securities 30 55  
Fair value, recurring | Level 2 | Agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities 18,221 15,693  
Fair value, recurring | Level 2 | Non-agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities 3,590 3,365  
Fair value, recurring | Level 2 | Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt and other securities 3,176 2,206  
Trading debt securities 439 231  
Liabilities:      
Short positions 392 100  
Fair value, recurring | Level 3      
Assets:      
Available-for-sale debt and other securities 0 0  
Trading debt securities 0 0  
Equity securities 0 0  
Residential mortgage loans held for sale 0 0  
Derivative assets 61 18  
Total assets 878 1,194  
Liabilities:      
Derivative liabilities 209 171  
Short positions 0 0  
Total liabilities 209 171  
Fair value, recurring | Level 3 | Interest Rate Contract      
Assets:      
Derivative assets 61 18 $ 7
Liabilities:      
Derivative liabilities 8 8 $ 8
Fair value, recurring | Level 3 | Foreign Exchange Contract      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative liabilities 0 0  
Fair value, recurring | Level 3 | Equity Derivatives      
Liabilities:      
Derivative liabilities 201 163  
Fair value, recurring | Level 3 | Commodity Contract      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative liabilities 0 0  
Fair value, recurring | Level 3 | Mortgage Servicing Rights      
Assets:      
Servicing rights 656 993  
Fair value, recurring | Level 3 | Residential Mortgage Loans      
Assets:      
Portfolio loans and leases at fair value 161 183  
Fair value, recurring | Level 3 | U.S. Treasury and federal agencies      
Assets:      
Available-for-sale debt and other securities 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions 0 0  
Fair value, recurring | Level 3 | Obligations of states and political subdivisions securities      
Assets:      
Available-for-sale debt and other securities 0 0  
Trading debt securities 0 0  
Fair value, recurring | Level 3 | Agency mortgage-backed securities | Residential Mortgage Loans      
Assets:      
Available-for-sale debt and other securities 0 0  
Trading debt securities 0 0  
Fair value, recurring | Level 3 | Agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities 0 0  
Fair value, recurring | Level 3 | Non-agency mortgage-backed securities | Commercial      
Assets:      
Available-for-sale debt and other securities 0 0  
Fair value, recurring | Level 3 | Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt and other securities 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions $ 0 $ 0  
[1] Amortized cost of $34,982 and $34,966 at December 31, 2020 and 2019, respectively.