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Loans and Related Allowance for Credit Losses (Home Equity and Residential Real Estate Credit Quality Indicators) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total Loans | $ 237,013 | $ 241,928
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 231 | 3,434
Financing receivable, originated in year one | 3,280 | 2,000
Financing receivable, originated in year two | 1,801 | 590
Financing receivable, originated in year three | 534 | 830
Financing receivable, originated in year four | 749 | 694
Prior | 4,293 | 4,000
Revolving Loans | 8,273 | 8,794
Revolving Loans Converted to Term | 4,332 | 3,746
Total Loans | 23,493 | 24,088
Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 2,521 | 7,996
Financing receivable, originated in year one | 7,311 | 4,158
Financing receivable, originated in year two | 3,354 | 1,172
Financing receivable, originated in year three | 974 | 1,942
Financing receivable, originated in year four | 1,665 | 2,069
Prior | 6,593 | 5,223
Total Loans | 22,418 | 22,560
Greater than or equal to 780 | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 127 | 2,019
Financing receivable, originated in year one | 1,925 | 1,094
Financing receivable, originated in year two | 960 | 311
Financing receivable, originated in year three | 273 | 525
Financing receivable, originated in year four | 467 | 449
Prior | 2,640 | 2,467
Revolving Loans | 5,148 | 5,382
Revolving Loans Converted to Term | 1,844 | 1,480
Total Loans | 13,384 | 13,727
Greater than or equal to 780 | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 1,409 | 5,425
Financing receivable, originated in year one | 5,220 | 3,099
Financing receivable, originated in year two | 2,411 | 814
Financing receivable, originated in year three | 661 | 1,432
Financing receivable, originated in year four | 1,206 | 1,538
Prior | 3,564 | 2,551
Total Loans | 14,471 | 14,859
720 to 779 | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 84 | 1,028
Financing receivable, originated in year one | 947 | 558
Financing receivable, originated in year two | 505 | 153
Financing receivable, originated in year three | 138 | 181
Financing receivable, originated in year four | 164 | 145
Prior | 865 | 777
Revolving Loans | 1,950 | 2,137
Revolving Loans Converted to Term | 1,084 | 941
Total Loans | 5,737 | 5,920
720 to 779 | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 1,061 | 2,268
Financing receivable, originated in year one | 1,767 | 820
Financing receivable, originated in year two | 708 | 220
Financing receivable, originated in year three | 182 | 340
Financing receivable, originated in year four | 308 | 335
Prior | 1,056 | 818
Total Loans | 5,082 | 4,801
660 to 719 | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 19 | 334
Financing receivable, originated in year one | 346 | 273
Financing receivable, originated in year two | 264 | 86
Financing receivable, originated in year three | 83 | 84
Financing receivable, originated in year four | 80 | 66
Prior | 428 | 402
Revolving Loans | 905 | 985
Revolving Loans Converted to Term | 678 | 625
Total Loans | 2,803 | 2,855
660 to 719 | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 51 | 252
Financing receivable, originated in year one | 267 | 161
Financing receivable, originated in year two | 166 | 76
Financing receivable, originated in year three | 81 | 98
Financing receivable, originated in year four | 85 | 92
Prior | 518 | 475
Total Loans | 1,168 | 1,154
Less than 660 | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 1 | 52
Financing receivable, originated in year one | 61 | 74
Financing receivable, originated in year two | 71 | 39
Financing receivable, originated in year three | 39 | 39
Financing receivable, originated in year four | 37 | 33
Prior | 350 | 345
Revolving Loans | 255 | 277
Revolving Loans Converted to Term | 628 | 620
Total Loans | 1,442 | 1,479
Less than 660 | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year |  | 40
Financing receivable, originated in year one | 43 | 48
Financing receivable, originated in year two | 38 | 33
Financing receivable, originated in year three | 23 | 31
Financing receivable, originated in year four | 24 | 41
Prior | 501 | 485
Total Loans | 629 | 678
No FICO score available | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year |  | 1
Financing receivable, originated in year one | 1 | 1
Financing receivable, originated in year two | 1 | 1
Financing receivable, originated in year three | 1 | 1
Financing receivable, originated in year four | 1 | 1
Prior | 10 | 9
Revolving Loans | 15 | 13
Revolving Loans Converted to Term | 98 | 80
Total Loans | 127 | 107
No FICO score available | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year |  | 4
Financing receivable, originated in year one | 6 | 2
Financing receivable, originated in year two | 2 | 2
Financing receivable, originated in year three | 2 | 3
Financing receivable, originated in year four | 3 | 6
Prior | 125 | 129
Total Loans | 138 | 146
Government insured or guaranteed loans | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year |  | 7
Financing receivable, originated in year one | 8 | 28
Financing receivable, originated in year two | 29 | 27
Financing receivable, originated in year three | 25 | 38
Financing receivable, originated in year four | 39 | 57
Prior | 829 | 765
Total Loans | 930 | 922
Greater than 100% | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year |  | 8
Financing receivable, originated in year one | 8 | 44
Financing receivable, originated in year two | 41 | 18
Financing receivable, originated in year three | 13 | 15
Financing receivable, originated in year four | 10 | 9
Prior | 73 | 88
Revolving Loans | 471 | 580
Revolving Loans Converted to Term | 254 | 279
Total Loans | 870 | 1,041
Greater than 100% | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year |  | 3
Financing receivable, originated in year one | 4 | 52
Financing receivable, originated in year two | 56 | 26
Financing receivable, originated in year three | 23 | 42
Financing receivable, originated in year four | 28 | 41
Prior | 150 | 160
Total Loans | 261 | 324
Greater than or equal to 80% to 100% | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 35 | 517
Financing receivable, originated in year one | 253 | 320
Financing receivable, originated in year two | 200 | 59
Financing receivable, originated in year three | 39 | 42
Financing receivable, originated in year four | 27 | 25
Prior | 139 | 158
Revolving Loans | 1,384 | 1,781
Revolving Loans Converted to Term | 615 | 591
Total Loans | 2,692 | 3,493
Greater than or equal to 80% to 100% | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 346 | 495
Financing receivable, originated in year one | 142 | 422
Financing receivable, originated in year two | 274 | 127
Financing receivable, originated in year three | 70 | 156
Financing receivable, originated in year four | 113 | 124
Prior | 328 | 307
Total Loans | 1,273 | 1,631
Less than 80% | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 196 | 2,909
Financing receivable, originated in year one | 3,019 | 1,636
Financing receivable, originated in year two | 1,560 | 513
Financing receivable, originated in year three | 482 | 773
Financing receivable, originated in year four | 712 | 660
Prior | 4,081 | 3,754
Revolving Loans | 6,418 | 6,433
Revolving Loans Converted to Term | 3,463 | 2,876
Total Loans | 19,931 | 19,554
Less than 80% | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 2,175 | 7,491
Financing receivable, originated in year one | 7,157 | 3,656
Financing receivable, originated in year two | 2,995 | 992
Financing receivable, originated in year three | 856 | 1,706
Financing receivable, originated in year four | 1,485 | 1,847
Prior | 5,286 | 3,991
Total Loans | $ 19,954 | $ 19,683

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