Annual report pursuant to Section 13 and 15(d)

Outstanding Loans and Leases and Allowance for Credit Losses - Residential Mortgage - Credit Quality Indicators (Details)

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Outstanding Loans and Leases and Allowance for Credit Losses - Residential Mortgage - Credit Quality Indicators (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 $ 979,124 $ 927,861
Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 27,935 34,311
Consumer real estate | Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 221,963 223,555
Originated in current fiscal year 92,817 75,405
Originated in fiscal year before current fiscal year 47,526 46,643
Originated two years before current fiscal year 24,465 15,203
Originated three years before current fiscal year 7,636 22,040
Originated four years before current fiscal year 11,217 25,070
Prior 38,302 39,194
Consumer real estate | Less than 620    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 893 1,082
Consumer real estate | Less than 620 | Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 2,451 2,717
Originated in current fiscal year 636 823
Originated in fiscal year before current fiscal year 442 177
Originated two years before current fiscal year 140 139
Originated three years before current fiscal year 120 170
Originated four years before current fiscal year 104 150
Prior 1,009 1,258
Consumer real estate | Greater than or equal to 620 and less than 680    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 1,434 1,798
Consumer real estate | Greater than or equal to 620 and less than 680 | Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 5,199 5,462
Originated in current fiscal year 1,511 1,804
Originated in fiscal year before current fiscal year 1,123 666
Originated two years before current fiscal year 477 468
Originated three years before current fiscal year 294 385
Originated four years before current fiscal year 307 368
Prior 1,487 1,771
Consumer real estate | Greater than or equal to 680 and less than 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 4,625 5,762
Consumer real estate | Greater than or equal to 680 and less than 740 | Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 24,532 25,349
Originated in current fiscal year 8,822 8,533
Originated in fiscal year before current fiscal year 5,454 4,679
Originated two years before current fiscal year 2,785 1,972
Originated three years before current fiscal year 1,057 2,427
Originated four years before current fiscal year 1,434 2,307
Prior 4,980 5,431
Consumer real estate | Greater than or equal to 740    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 20,983 25,669
Consumer real estate | Greater than or equal to 740 | Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 177,077 178,209
Originated in current fiscal year 78,003 60,419
Originated in fiscal year before current fiscal year 37,021 39,107
Originated two years before current fiscal year 19,913 12,254
Originated three years before current fiscal year 5,949 18,716
Originated four years before current fiscal year 9,137 20,275
Prior 27,054 27,438
Less than or equal to 90 percent | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 27,594 33,447
Less than or equal to 90 percent | Consumer real estate | Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 206,562 207,389
Originated in current fiscal year 87,051 68,907
Originated in fiscal year before current fiscal year 43,597 43,771
Originated two years before current fiscal year 23,205 14,658
Originated three years before current fiscal year 7,392 21,589
Originated four years before current fiscal year 10,956 22,967
Prior 34,361 35,497
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 130 351
Greater than 90 percent but less than or equal to 100 percent | Consumer real estate | Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 1,938 3,138
Originated in current fiscal year 1,401 1,970
Originated in fiscal year before current fiscal year 331 684
Originated two years before current fiscal year 81 128
Originated three years before current fiscal year 17 70
Originated four years before current fiscal year 14 96
Prior 94 190
Greater than 100 percent | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 211 513
Greater than 100 percent | Consumer real estate | Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 759 1,210
Originated in current fiscal year 520 702
Originated in fiscal year before current fiscal year 112 174
Originated two years before current fiscal year 29 47
Originated three years before current fiscal year 11 39
Originated four years before current fiscal year 12 37
Prior 75 211
Fully-insured loans | Consumer real estate | Residential Mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total as of December 31, 2021 12,704 11,818
Originated in current fiscal year 3,845 3,826
Originated in fiscal year before current fiscal year 3,486 2,014
Originated two years before current fiscal year 1,150 370
Originated three years before current fiscal year 216 342
Originated four years before current fiscal year 235 1,970
Prior $ 3,772 $ 3,296