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Loans and Related Allowance for Credit Losses (Home Equity and Residential Real Estate Credit Quality Indicators) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total Loans | $ 294,704 | $ 241,928
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 235 | 3,434
Financing receivable, originated in year one | 3,072 | 2,000
Financing receivable, originated in year two | 1,618 | 590
Financing receivable, originated in year three | 485 | 830
Financing receivable, originated in year four | 682 | 694
Prior | 4,009 | 4,000
Revolving Loans | 10,168 | 8,794
Revolving Loans Converted to Term | 4,905 | 3,746
Total Loans | 25,174 | 24,088
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 | 10 |
Financing receivable, originated in year two | 9 |
Financing receivable, originated in year three | 7 |
Financing receivable, originated in year four | 4 |
Prior | 113 |
Revolving Loans | 2,263 |
Revolving Loans Converted to Term | 5 |
Total Loans | 2,418 |
Home equity | Financial Asset Originated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 228 |
Financing receivable, originated in year one | 3,062 |
Financing receivable, originated in year two | 1,609 |
Financing receivable, originated in year three | 478 |
Financing receivable, originated in year four | 678 |
Prior | 3,896 |
Revolving Loans | 7,905 |
Revolving Loans Converted to Term | 4,900 |
Total Loans | 22,756 |
Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 8,215 | 7,996
Financing receivable, originated in year one | 10,489 | 4,158
Financing receivable, originated in year two | 4,360 | 1,172
Financing receivable, originated in year three | 1,464 | 1,942
Financing receivable, originated in year four | 2,143 | 2,069
Prior | 10,175 | 5,223
Total Loans | 36,846 | 22,560
Residential real estate | Financial Asset Originated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 6,306 |
Financing receivable, originated in year one | 6,647 |
Financing receivable, originated in year two | 2,774 |
Financing receivable, originated in year three | 790 |
Financing receivable, originated in year four | 1,425 |
Prior | 5,870 |
Total Loans | 23,812 |
Residential real estate | Acquired Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 1,909 |
Financing receivable, originated in year one | 3,842 |
Financing receivable, originated in year two | 1,586 |
Financing receivable, originated in year three | 674 |
Financing receivable, originated in year four | 718 |
Prior | 4,305 |
Total Loans | 13,034 |
Greater than or equal to 780 | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 132 | 2,019
Financing receivable, originated in year one | 1,905 | 1,094
Financing receivable, originated in year two | 897 | 311
Financing receivable, originated in year three | 248 | 525
Financing receivable, originated in year four | 436 | 449
Prior | 2,469 | 2,467
Revolving Loans | 6,028 | 5,382
Revolving Loans Converted to Term | 2,310 | 1,480
Total Loans | 14,425 | 13,727
Greater than or equal to 780 | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 4,691 | 5,425
Financing receivable, originated in year one | 7,211 | 3,099
Financing receivable, originated in year two | 2,922 | 814
Financing receivable, originated in year three | 832 | 1,432
Financing receivable, originated in year four | 1,361 | 1,538
Prior | 5,170 | 2,551
Total Loans | 22,187 | 14,859
720 to 779 | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 78 | 1,028
Financing receivable, originated in year one | 818 | 558
Financing receivable, originated in year two | 434 | 153
Financing receivable, originated in year three | 125 | 181
Financing receivable, originated in year four | 143 | 145
Prior | 779 | 777
Revolving Loans | 2,469 | 2,137
Revolving Loans Converted to Term | 1,239 | 941
Total Loans | 6,085 | 5,920
720 to 779 | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 2,667 | 2,268
Financing receivable, originated in year one | 2,213 | 820
Financing receivable, originated in year two | 870 | 220
Financing receivable, originated in year three | 287 | 340
Financing receivable, originated in year four | 422 | 335
Prior | 1,838 | 818
Total Loans | 8,297 | 4,801
660 to 719 | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 20 | 334
Financing receivable, originated in year one | 297 | 273
Financing receivable, originated in year two | 222 | 86
Financing receivable, originated in year three | 72 | 84
Financing receivable, originated in year four | 71 | 66
Prior | 410 | 402
Revolving Loans | 1,168 | 985
Revolving Loans Converted to Term | 690 | 625
Total Loans | 2,950 | 2,855
660 to 719 | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 252 | 252
Financing receivable, originated in year one | 530 | 161
Financing receivable, originated in year two | 299 | 76
Financing receivable, originated in year three | 163 | 98
Financing receivable, originated in year four | 143 | 92
Prior | 913 | 475
Total Loans | 2,300 | 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 | 50 | 74
Financing receivable, originated in year two | 64 | 39
Financing receivable, originated in year three | 38 | 39
Financing receivable, originated in year four | 31 | 33
Prior | 339 | 345
Revolving Loans | 412 | 277
Revolving Loans Converted to Term | 575 | 620
Total Loans | 1,512 | 1,479
Less than 660 | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 29 | 40
Financing receivable, originated in year one | 110 | 48
Financing receivable, originated in year two | 101 | 33
Financing receivable, originated in year three | 90 | 31
Financing receivable, originated in year four | 99 | 41
Prior | 872 | 485
Total Loans | 1,301 | 678
No FICO score available | Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 2 | 1
Financing receivable, originated in year one | 2 | 1
Financing receivable, originated in year two | 1 | 1
Financing receivable, originated in year three | 2 | 1
Financing receivable, originated in year four | 1 | 1
Prior | 12 | 9
Revolving Loans | 91 | 13
Revolving Loans Converted to Term | 91 | 80
Total Loans | 202 | 107
No FICO score available | Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 575 | 4
Financing receivable, originated in year one | 411 | 2
Financing receivable, originated in year two | 124 | 2
Financing receivable, originated in year three | 57 | 3
Financing receivable, originated in year four | 73 | 6
Prior | 579 | 129
Total Loans | 1,819 | 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 | 14 | 28
Financing receivable, originated in year two | 44 | 27
Financing receivable, originated in year three | 35 | 38
Financing receivable, originated in year four | 45 | 57
Prior | 803 | 765
Total Loans | 942 | 922
Government insured or guaranteed loans | Residential real estate | Acquired Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 1 |
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 | 37 |
Total Loans | 77 |
Government insured or guaranteed loans | Residential real estate | Financial Asset Originated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in year one | 10 |
Financing receivable, originated in year two | 29 |
Financing receivable, originated in year three | 24 |
Financing receivable, originated in year four | 35 |
Prior | 767 |
Total Loans | 865 |
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 year one | 20 |
Financing receivable, originated in year two | 32 |
Financing receivable, originated in year three | 9 |
Financing receivable, originated in year four | 7 |
Prior | 100 |
Revolving Loans | 418 |
Revolving Loans Converted to Term | 203 |
Total Loans | 789 |
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 | 11 |
Financing receivable, originated in year one | 24 |
Financing receivable, originated in year two | 3 |
Financing receivable, originated in year three | 2 |
Financing receivable, originated in year four | 4 |
Prior | 23 |
Total Loans | 67 |
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 | 16 |
Financing receivable, originated in year two | 58 |
Financing receivable, originated in year three | 18 |
Financing receivable, originated in year four | 29 |
Prior | 194 |
Total Loans | 316 |
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 | 1 |
Financing receivable, originated in year one | 5 |
Financing receivable, originated in year two | 3 |
Financing receivable, originated in year three | 2 |
Financing receivable, originated in year four | 1 |
Prior | 16 |
Revolving Loans | 578 |
Revolving Loans Converted to Term | 1 |
Total Loans | 607 |
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 | 23 |
Financing receivable, originated in year one | 176 |
Financing receivable, originated in year two | 145 |
Financing receivable, originated in year three | 28 |
Financing receivable, originated in year four | 19 |
Prior | 119 |
Revolving Loans | 1,081 |
Revolving Loans Converted to Term | 548 |
Total Loans | 2,139 |
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 | 635 |
Financing receivable, originated in year one | 1,407 |
Financing receivable, originated in year two | 612 |
Financing receivable, originated in year three | 293 |
Financing receivable, originated in year four | 286 |
Prior | 664 |
Total Loans | 3,897 |
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 | 727 |
Financing receivable, originated in year one | 157 |
Financing receivable, originated in year two | 160 |
Financing receivable, originated in year three | 44 |
Financing receivable, originated in year four | 63 |
Prior | 248 |
Total Loans | 1,399 |
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 | 6 |
Financing receivable, originated in year one | 5 |
Financing receivable, originated in year two | 6 |
Financing receivable, originated in year three | 5 |
Financing receivable, originated in year four | 3 |
Prior | 90 |
Revolving Loans | 1,572 |
Revolving Loans Converted to Term | 3 |
Total Loans | 1,690 |
Less than 80% | Home equity | Financial Asset Originated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 205 |
Financing receivable, originated in year one | 2,866 |
Financing receivable, originated in year two | 1,432 |
Financing receivable, originated in year three | 441 |
Financing receivable, originated in year four | 652 |
Prior | 3,677 |
Revolving Loans | 6,406 |
Revolving Loans Converted to Term | 4,149 |
Total Loans | 19,828 |
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 | 1,158 |
Financing receivable, originated in year one | 2,094 |
Financing receivable, originated in year two | 843 |
Financing receivable, originated in year three | 330 |
Financing receivable, originated in year four | 414 |
Prior | 3,581 |
Total Loans | 8,420 |
Less than 80% | Residential real estate | Financial Asset Originated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 5,578 |
Financing receivable, originated in year one | 6,464 |
Financing receivable, originated in year two | 2,527 |
Financing receivable, originated in year three | 704 |
Financing receivable, originated in year four | 1,298 |
Prior | 4,661 |
Total Loans | 21,232 |
No LTV ratio available | Home equity | Acquired Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Prior | 4 |
Revolving Loans | 45 |
Revolving Loans Converted to Term | 1 |
Total Loans | 50 |
No LTV ratio available | Residential real estate | Acquired Loans Portfolio |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Financing receivable, originated in current year | 104 |
Financing receivable, originated in year one | 313 |
Financing receivable, originated in year two | 114 |
Financing receivable, originated in year three | 38 |
Financing receivable, originated in year four | 4 |
Total Loans | $ 573 |

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