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Loans and Related Allowance for Credit Losses, Loans by Loan to Value Ratio, Consumer (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 911,807 $ 895,394 $ 861,572
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
High value properties, threshold 1    
Total Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 26,665 101,969  
Term loans by origination year, fiscal year before current fiscal year 97,218 55,214  
Term loans by origination year, two years before current fiscal year 51,577 34,661  
Term loans by origination year, three years before current fiscal year 31,181 11,714  
Term loans by origination year, four years before current fiscal year 10,286 15,842  
Term loans by origination year, more than five years before current fiscal year 83,887 77,309  
Revolving loans 77,106 78,564  
Revolving loans converted to term loans 7,173 7,001  
Loans 385,093 382,274  
Residential mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 18,441 70,176  
Term loans by origination year, fiscal year before current fiscal year 68,614 41,794  
Term loans by origination year, two years before current fiscal year 39,789 25,234  
Term loans by origination year, three years before current fiscal year 23,082 8,122  
Term loans by origination year, four years before current fiscal year 7,322 14,245  
Term loans by origination year, more than five years before current fiscal year 82,074 76,380  
Revolving loans 14,509 16,305  
Revolving loans converted to term loans 6,803 6,632  
Loans 260,634 258,888  
Residential mortgage - first lien [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 18,436 70,148  
Term loans by origination year, fiscal year before current fiscal year 68,583 41,774  
Term loans by origination year, two years before current fiscal year 39,770 25,203  
Term loans by origination year, three years before current fiscal year 23,053 8,095  
Term loans by origination year, four years before current fiscal year 7,298 14,223  
Term loans by origination year, more than five years before current fiscal year 81,367 75,618  
Revolving loans 4,728 5,313  
Revolving loans converted to term loans 2,007 1,896  
Loans 245,242 242,270  
Residential mortgage - first lien [Member] | Government insured or guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 1 14  
Term loans by origination year, fiscal year before current fiscal year 25 134  
Term loans by origination year, two years before current fiscal year 124 209  
Term loans by origination year, three years before current fiscal year 167 349  
Term loans by origination year, four years before current fiscal year 283 364  
Term loans by origination year, more than five years before current fiscal year 9,970 12,088  
Revolving loans 0 0  
Revolving loans converted to term loans 0 0  
Loans 10,570 13,158  
Residential mortgage - first lien [Member] | LTV 0-60% [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 7,187 26,618  
Term loans by origination year, fiscal year before current fiscal year 27,906 22,882  
Term loans by origination year, two years before current fiscal year 24,257 16,063  
Term loans by origination year, three years before current fiscal year 15,714 5,310  
Term loans by origination year, four years before current fiscal year 5,040 11,030  
Term loans by origination year, more than five years before current fiscal year 64,410 57,880  
Revolving loans 3,997 4,348  
Revolving loans converted to term loans 1,772 1,644  
Loans 150,283 145,775  
Residential mortgage - first lien [Member] | LTV 60.01-80% [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 10,940 42,893  
Term loans by origination year, fiscal year before current fiscal year 39,437 18,188  
Term loans by origination year, two years before current fiscal year 14,916 8,356  
Term loans by origination year, three years before current fiscal year 6,725 2,234  
Term loans by origination year, four years before current fiscal year 1,808 2,647  
Term loans by origination year, more than five years before current fiscal year 6,340 5,017  
Revolving loans 549 674  
Revolving loans converted to term loans 177 188  
Loans 80,892 80,197  
Residential mortgage - first lien [Member] | LTV 80.01-100% [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 290 486  
Term loans by origination year, fiscal year before current fiscal year 1,056 437  
Term loans by origination year, two years before current fiscal year 354 474  
Term loans by origination year, three years before current fiscal year 359 147  
Term loans by origination year, four years before current fiscal year 121 134  
Term loans by origination year, more than five years before current fiscal year 342 339  
Revolving loans 111 157  
Revolving loans converted to term loans 39 42  
Loans 2,672 2,216  
Residential mortgage - first lien [Member] | LTV 100.01-120% [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 10  
Term loans by origination year, fiscal year before current fiscal year 25 31  
Term loans by origination year, two years before current fiscal year 26 24  
Term loans by origination year, three years before current fiscal year 18 11  
Term loans by origination year, four years before current fiscal year 8 7  
Term loans by origination year, more than five years before current fiscal year 45 48  
Revolving loans 22 33  
Revolving loans converted to term loans 5 8  
Loans 149 172  
Residential mortgage - first lien [Member] | LTV greater than 120% [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 5  
Term loans by origination year, fiscal year before current fiscal year 12 10  
Term loans by origination year, two years before current fiscal year 5 10  
Term loans by origination year, three years before current fiscal year 5 4  
Term loans by origination year, four years before current fiscal year 1 3  
Term loans by origination year, more than five years before current fiscal year 29 35  
Revolving loans 12 14  
Revolving loans converted to term loans 3 3  
Loans 67 84  
Residential mortgage - first lien [Member] | No LTV/CLTV available [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 18 122  
Term loans by origination year, fiscal year before current fiscal year 122 92  
Term loans by origination year, two years before current fiscal year 88 67  
Term loans by origination year, three years before current fiscal year 65 40  
Term loans by origination year, four years before current fiscal year 37 38  
Term loans by origination year, more than five years before current fiscal year 231 211  
Revolving loans 37 87  
Revolving loans converted to term loans 11 11  
Loans 609 668  
Residential mortgage - junior lien [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 5 28  
Term loans by origination year, fiscal year before current fiscal year 31 20  
Term loans by origination year, two years before current fiscal year 19 31  
Term loans by origination year, three years before current fiscal year 29 27  
Term loans by origination year, four years before current fiscal year 24 22  
Term loans by origination year, more than five years before current fiscal year 707 762  
Revolving loans 9,781 10,992  
Revolving loans converted to term loans 4,796 4,736  
Loans 15,392 16,618  
Residential mortgage - junior lien [Member] | LTV 0-60% [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 450 475  
Revolving loans 7,388 7,949  
Revolving loans converted to term loans 3,707 3,588  
Loans 11,545 12,012  
Residential mortgage - junior lien [Member] | LTV 60.01-80% [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 145 172  
Revolving loans 1,875 2,329  
Revolving loans converted to term loans 793 823  
Loans 2,813 3,324  
Residential mortgage - junior lien [Member] | LTV 80.01-100% [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 43 55  
Revolving loans 403 554  
Revolving loans converted to term loans 223 241  
Loans 669 850  
Residential mortgage - junior lien [Member] | LTV 100.01-120% [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 9 13  
Revolving loans 73 104  
Revolving loans converted to term loans 34 42  
Loans 116 159  
Residential mortgage - junior lien [Member] | LTV greater than 120% [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 0 0  
Term loans by origination year, fiscal year before current fiscal year 0 0  
Term loans by origination year, two years before current fiscal year 0 0  
Term loans by origination year, three years before current fiscal year 0 0  
Term loans by origination year, four years before current fiscal year 0 0  
Term loans by origination year, more than five years before current fiscal year 2 3  
Revolving loans 25 35  
Revolving loans converted to term loans 10 13  
Loans 37 51  
Residential mortgage - junior lien [Member] | No LTV/CLTV available [Member] | Non-government insured/guaranteed [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term loans by origination year, current fiscal year 5 28  
Term loans by origination year, fiscal year before current fiscal year 31 20  
Term loans by origination year, two years before current fiscal year 19 31  
Term loans by origination year, three years before current fiscal year 29 27  
Term loans by origination year, four years before current fiscal year 24 22  
Term loans by origination year, more than five years before current fiscal year 58 44  
Revolving loans 17 21  
Revolving loans converted to term loans 29 29  
Loans $ 212 $ 222