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Loans and Related Allowance for Credit Losses (Home Equity and Residential Real Estate Credit Quality Indicators) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Total Loans | [1] | $ 290,230 | $ 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 |  | 2,825 | 2,000
Financing receivable, originated in year two |  | 1,424 | 590
Financing receivable, originated in year three |  | 428 | 830
Financing receivable, originated in year four |  | 619 | 694
Prior |  | 3,636 | 4,000
Revolving Loans |  | 9,819 | 8,794
Revolving Loans Converted to Term |  | 5,497 | 3,746
Total Loans |  | 24,479 | 24,088
Home equity | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 12 |
Financing receivable, originated in year one |  | 8 |
Financing receivable, originated in year two |  | 7 |
Financing receivable, originated in year three |  | 7 |
Financing receivable, originated in year four |  | 4 |
Prior |  | 101 |
Revolving Loans |  | 2,229 |
Revolving Loans Converted to Term |  | 2 |
Total Loans |  | 2,370 |
Home equity | Financial Asset Originated |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 219 |
Financing receivable, originated in year one |  | 2,817 |
Financing receivable, originated in year two |  | 1,417 |
Financing receivable, originated in year three |  | 421 |
Financing receivable, originated in year four |  | 615 |
Prior |  | 3,535 |
Revolving Loans |  | 7,590 |
Revolving Loans Converted to Term |  | 5,495 |
Total Loans |  | 22,109 |
Residential real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 12,828 | 7,996
Financing receivable, originated in year one |  | 9,478 | 4,158
Financing receivable, originated in year two |  | 3,661 | 1,172
Financing receivable, originated in year three |  | 1,258 | 1,942
Financing receivable, originated in year four |  | 1,874 | 2,069
Prior |  | 9,115 | 5,223
Total Loans |  | 38,214 | 22,560
Residential real estate | Financial Asset Originated |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 10,072 |
Financing receivable, originated in year one |  | 5,965 |
Financing receivable, originated in year two |  | 2,336 |
Financing receivable, originated in year three |  | 691 |
Financing receivable, originated in year four |  | 1,247 |
Prior |  | 5,280 |
Total Loans |  | 25,591 |
Residential real estate | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 2,756 |
Financing receivable, originated in year one |  | 3,513 |
Financing receivable, originated in year two |  | 1,325 |
Financing receivable, originated in year three |  | 567 |
Financing receivable, originated in year four |  | 627 |
Prior |  | 3,835 |
Total Loans |  | 12,623 |
Greater than or equal to 780 | Home equity |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 129 | 2,019
Financing receivable, originated in year one |  | 1,756 | 1,094
Financing receivable, originated in year two |  | 787 | 311
Financing receivable, originated in year three |  | 221 | 525
Financing receivable, originated in year four |  | 403 | 449
Prior |  | 2,237 | 2,467
Revolving Loans |  | 5,812 | 5,382
Revolving Loans Converted to Term |  | 2,706 | 1,480
Total Loans |  | 14,051 | 13,727
Greater than or equal to 780 | Residential real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 7,778 | 5,425
Financing receivable, originated in year one |  | 6,577 | 3,099
Financing receivable, originated in year two |  | 2,405 | 814
Financing receivable, originated in year three |  | 701 | 1,432
Financing receivable, originated in year four |  | 1,170 | 1,538
Prior |  | 4,549 | 2,551
Total Loans |  | 23,180 | 14,859
720 to 779 | Home equity |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 69 | 1,028
Financing receivable, originated in year one |  | 745 | 558
Financing receivable, originated in year two |  | 385 | 153
Financing receivable, originated in year three |  | 107 | 181
Financing receivable, originated in year four |  | 125 | 145
Prior |  | 712 | 777
Revolving Loans |  | 2,403 | 2,137
Revolving Loans Converted to Term |  | 1,405 | 941
Total Loans |  | 5,951 | 5,920
720 to 779 | Residential real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 3,957 | 2,268
Financing receivable, originated in year one |  | 1,917 | 820
Financing receivable, originated in year two |  | 733 | 220
Financing receivable, originated in year three |  | 250 | 340
Financing receivable, originated in year four |  | 372 | 335
Prior |  | 1,670 | 818
Total Loans |  | 8,899 | 4,801
660 to 719 | Home equity |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 24 | 334
Financing receivable, originated in year one |  | 270 | 273
Financing receivable, originated in year two |  | 192 | 86
Financing receivable, originated in year three |  | 65 | 84
Financing receivable, originated in year four |  | 59 | 66
Prior |  | 370 | 402
Revolving Loans |  | 1,140 | 985
Revolving Loans Converted to Term |  | 741 | 625
Total Loans |  | 2,861 | 2,855
660 to 719 | Residential real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 498 | 252
Financing receivable, originated in year one |  | 464 | 161
Financing receivable, originated in year two |  | 292 | 76
Financing receivable, originated in year three |  | 145 | 98
Financing receivable, originated in year four |  | 144 | 92
Prior |  | 821 | 475
Total Loans |  | 2,364 | 1,154
Less than 660 | Home equity |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 3 | 52
Financing receivable, originated in year one |  | 52 | 74
Financing receivable, originated in year two |  | 59 | 39
Financing receivable, originated in year three |  | 34 | 39
Financing receivable, originated in year four |  | 31 | 33
Prior |  | 305 | 345
Revolving Loans |  | 411 | 277
Revolving Loans Converted to Term |  | 561 | 620
Total Loans |  | 1,456 | 1,479
Less than 660 | Residential real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 52 | 40
Financing receivable, originated in year one |  | 123 | 48
Financing receivable, originated in year two |  | 92 | 33
Financing receivable, originated in year three |  | 80 | 31
Financing receivable, originated in year four |  | 85 | 41
Prior |  | 805 | 485
Total Loans |  | 1,237 | 678
No FICO score available | Home equity |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 6 | 1
Financing receivable, originated in year one |  | 2 | 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 |  | 12 | 9
Revolving Loans |  | 53 | 13
Revolving Loans Converted to Term |  | 84 | 80
Total Loans |  | 160 | 107
No FICO score available | Residential real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 542 | 4
Financing receivable, originated in year one |  | 382 | 2
Financing receivable, originated in year two |  | 101 | 2
Financing receivable, originated in year three |  | 50 | 3
Financing receivable, originated in year four |  | 63 | 6
Prior |  | 547 | 129
Total Loans |  | 1,685 | 146
Government insured or guaranteed loans | Residential real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 1 | 7
Financing receivable, originated in year one |  | 15 | 28
Financing receivable, originated in year two |  | 38 | 27
Financing receivable, originated in year three |  | 32 | 38
Financing receivable, originated in year four |  | 40 | 57
Prior |  | 723 | 765
Total Loans |  | 849 | 922
Government insured or guaranteed loans | Residential real estate | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in year one |  | 4 |
Financing receivable, originated in year two |  | 14 |
Financing receivable, originated in year three |  | 11 |
Financing receivable, originated in year four |  | 10 |
Prior |  | 35 |
Total Loans |  | 74 |
Government insured or guaranteed loans | Residential real estate | Financial Asset Originated |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 1 |
Financing receivable, originated in year one |  | 11 |
Financing receivable, originated in year two |  | 24 |
Financing receivable, originated in year three |  | 21 |
Financing receivable, originated in year four |  | 30 |
Prior |  | 688 |
Total Loans |  | 775 |
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 |  |  | 44
Financing receivable, originated in year two |  |  | 18
Financing receivable, originated in year three |  |  | 15
Financing receivable, originated in year four |  |  | 9
Prior |  |  | 88
Revolving Loans |  |  | 580
Revolving Loans Converted to Term |  |  | 279
Total Loans |  |  | 1,041
Greater than 100% | Home equity | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Prior |  | 3 |
Revolving Loans |  | 68 |
Total Loans |  | 71 |
Greater than 100% | Home equity | Financial Asset Originated |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 1 |
Financing receivable, originated in year one |  | 16 |
Financing receivable, originated in year two |  | 15 |
Financing receivable, originated in year three |  | 2 |
Financing receivable, originated in year four |  | 2 |
Prior |  | 30 |
Revolving Loans |  | 270 |
Revolving Loans Converted to Term |  | 91 |
Total Loans |  | 427 |
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 |  |  | 52
Financing receivable, originated in year two |  |  | 26
Financing receivable, originated in year three |  |  | 42
Financing receivable, originated in year four |  |  | 41
Prior |  |  | 160
Total Loans |  |  | 324
Greater than 100% | Residential real estate | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 13 |
Financing receivable, originated in year one |  | 23 |
Financing receivable, originated in year two |  | 2 |
Financing receivable, originated in year three |  | 2 |
Financing receivable, originated in year four |  | 4 |
Prior |  | 18 |
Total Loans |  | 62 |
Greater than 100% | Residential real estate | Financial Asset Originated |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 1 |
Financing receivable, originated in year one |  | 9 |
Financing receivable, originated in year two |  | 12 |
Financing receivable, originated in year three |  | 2 |
Financing receivable, originated in year four |  | 4 |
Prior |  | 71 |
Total Loans |  | 99 |
Greater than or equal to 80% to 100% | Home equity |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  |  | 517
Financing receivable, originated in year one |  |  | 320
Financing receivable, originated in year two |  |  | 59
Financing receivable, originated in year three |  |  | 42
Financing receivable, originated in year four |  |  | 25
Prior |  |  | 158
Revolving Loans |  |  | 1,781
Revolving Loans Converted to Term |  |  | 591
Total Loans |  |  | 3,493
Greater than or equal to 80% to 100% | Home equity | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 4 |
Financing receivable, originated in year one |  | 4 |
Financing receivable, originated in year two |  | 2 |
Financing receivable, originated in year three |  | 2 |
Financing receivable, originated in year four |  | 1 |
Prior |  | 14 |
Revolving Loans |  | 567 |
Revolving Loans Converted to Term |  | 1 |
Total Loans |  | 595 |
Greater than or equal to 80% to 100% | Home equity | Financial Asset Originated |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 17 |
Financing receivable, originated in year one |  | 97 |
Financing receivable, originated in year two |  | 87 |
Financing receivable, originated in year three |  | 18 |
Financing receivable, originated in year four |  | 13 |
Prior |  | 78 |
Revolving Loans |  | 847 |
Revolving Loans Converted to Term |  | 570 |
Total Loans |  | 1,727 |
Greater than or equal to 80% to 100% | Residential real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  |  | 495
Financing receivable, originated in year one |  |  | 422
Financing receivable, originated in year two |  |  | 127
Financing receivable, originated in year three |  |  | 156
Financing receivable, originated in year four |  |  | 124
Prior |  |  | 307
Total Loans |  |  | 1,631
Greater than or equal to 80% to 100% | Residential real estate | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 847 |
Financing receivable, originated in year one |  | 1,225 |
Financing receivable, originated in year two |  | 488 |
Financing receivable, originated in year three |  | 241 |
Financing receivable, originated in year four |  | 243 |
Prior |  | 534 |
Total Loans |  | 3,578 |
Greater than or equal to 80% to 100% | Residential real estate | Financial Asset Originated |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 711 |
Financing receivable, originated in year one |  | 143 |
Financing receivable, originated in year two |  | 107 |
Financing receivable, originated in year three |  | 30 |
Financing receivable, originated in year four |  | 34 |
Prior |  | 165 |
Total Loans |  | 1,190 |
Less than 80% | Home equity |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  |  | 2,909
Financing receivable, originated in year one |  |  | 1,636
Financing receivable, originated in year two |  |  | 513
Financing receivable, originated in year three |  |  | 773
Financing receivable, originated in year four |  |  | 660
Prior |  |  | 3,754
Revolving Loans |  |  | 6,433
Revolving Loans Converted to Term |  |  | 2,876
Total Loans |  |  | 19,554
Less than 80% | Home equity | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 7 |
Financing receivable, originated in year one |  | 4 |
Financing receivable, originated in year two |  | 5 |
Financing receivable, originated in year three |  | 5 |
Financing receivable, originated in year four |  | 3 |
Prior |  | 80 |
Revolving Loans |  | 1,575 |
Revolving Loans Converted to Term |  | 1 |
Total Loans |  | 1,680 |
Less than 80% | Home equity | Financial Asset Originated |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 201 |
Financing receivable, originated in year one |  | 2,704 |
Financing receivable, originated in year two |  | 1,315 |
Financing receivable, originated in year three |  | 401 |
Financing receivable, originated in year four |  | 600 |
Prior |  | 3,427 |
Revolving Loans |  | 6,473 |
Revolving Loans Converted to Term |  | 4,834 |
Total Loans |  | 19,955 |
Less than 80% | Residential real estate |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  |  | 7,491
Financing receivable, originated in year one |  |  | 3,656
Financing receivable, originated in year two |  |  | 992
Financing receivable, originated in year three |  |  | 1,706
Financing receivable, originated in year four |  |  | 1,847
Prior |  |  | 3,991
Total Loans |  |  | $ 19,683
Less than 80% | Residential real estate | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 1,689 |
Financing receivable, originated in year one |  | 1,941 |
Financing receivable, originated in year two |  | 728 |
Financing receivable, originated in year three |  | 287 |
Financing receivable, originated in year four |  | 369 |
Prior |  | 3,248 |
Total Loans |  | 8,262 |
Less than 80% | Residential real estate | Financial Asset Originated |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 9,359 |
Financing receivable, originated in year one |  | 5,802 |
Financing receivable, originated in year two |  | 2,193 |
Financing receivable, originated in year three |  | 638 |
Financing receivable, originated in year four |  | 1,179 |
Prior |  | 4,356 |
Total Loans |  | 23,527 |
No LTV ratio available | Home equity | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 1 |
Prior |  | 4 |
Revolving Loans |  | 19 |
Total Loans |  | 24 |
No LTV ratio available | Residential real estate | Acquired Loans Portfolio |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |
Financing receivable, originated in current year |  | 207 |
Financing receivable, originated in year one |  | 320 |
Financing receivable, originated in year two |  | 93 |
Financing receivable, originated in year three |  | 26 |
Financing receivable, originated in year four |  | 1 |
Total Loans |  | $ 647 |
[1] | Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $2.0 billion, Loans held for investment of $1.6 billion and Other assets of $0.1 billion at September 30, 2021. Comparable amounts at December 31, 2020 were $1.2 billion, $1.4 billion and $0.1 billion, respectively.

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