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Asset Quality - Commercial Credit Exposure (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 100,926 $ 101,185
Accrued interest 242 241
Commercial Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 3,020 16,230
One year prior 14,673 10,657
Two years prior 10,122 7,206
Three years prior 6,746 4,635
Four years prior 4,227 3,237
Prior 11,022 7,295
Revolving Loans Amortized Cost Basis 21,470 22,529
Revolving Loans Converted to Term Loans Amortized Cost Basis 134 191
Total 71,414 71,980
Accrued interest 143 140
Commercial Loans | Commercial and Industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 2,250 13,174
One year prior 11,628 5,712
Two years prior 5,301 4,285
Three years prior 4,009 2,881
Four years prior 2,596 2,134
Prior 5,954 2,995
Revolving Loans Amortized Cost Basis 20,645 21,585
Revolving Loans Converted to Term Loans Amortized Cost Basis 103 141
Total 52,486 52,907
Commercial Loans | Commercial and Industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 2,246 13,100
One year prior 11,524 5,487
Two years prior 5,062 4,040
Three years prior 3,728 2,617
Four years prior 2,360 1,967
Prior 5,560 2,709
Revolving Loans Amortized Cost Basis 18,992 19,832
Revolving Loans Converted to Term Loans Amortized Cost Basis 81 118
Total 49,553 49,870
Commercial Loans | Commercial and Industrial | Criticized (Accruing)    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 4 66
One year prior 96 198
Two years prior 220 174
Three years prior 217 236
Four years prior 223 150
Prior 340 279
Revolving Loans Amortized Cost Basis 1,426 1,527
Revolving Loans Converted to Term Loans Amortized Cost Basis 20 22
Total 2,546 2,652
Commercial Loans | Commercial and Industrial | Criticized (Nonaccruing)    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 0 8
One year prior 8 27
Two years prior 19 71
Three years prior 64 28
Four years prior 13 17
Prior 54 7
Revolving Loans Amortized Cost Basis 227 226
Revolving Loans Converted to Term Loans Amortized Cost Basis 2 1
Total 387 385
Commercial Loans | Commercial mortgage    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 602 1,603
One year prior 1,617 3,080
Two years prior 3,041 1,822
Three years prior 1,706 1,016
Four years prior 982 839
Prior 3,930 3,370
Revolving Loans Amortized Cost Basis 793 912
Revolving Loans Converted to Term Loans Amortized Cost Basis 31 45
Total 12,702 12,687
Commercial Loans | Commercial mortgage | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 602 1,591
One year prior 1,603 2,937
Two years prior 2,916 1,737
Three years prior 1,599 867
Four years prior 819 765
Prior 3,589 3,027
Revolving Loans Amortized Cost Basis 695 885
Revolving Loans Converted to Term Loans Amortized Cost Basis 29 43
Total 11,852 11,852
Commercial Loans | Commercial mortgage | Criticized (Accruing)    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 0 12
One year prior 14 142
Two years prior 123 81
Three years prior 103 145
Four years prior 159 72
Prior 290 255
Revolving Loans Amortized Cost Basis 93 22
Revolving Loans Converted to Term Loans Amortized Cost Basis 2 2
Total 784 731
Commercial Loans | Commercial mortgage | Criticized (Nonaccruing)    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 0 0
One year prior 0 1
Two years prior 2 4
Three years prior 4 4
Four years prior 4 2
Prior 51 88
Revolving Loans Amortized Cost Basis 5 5
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 66 104
Commercial Loans | Construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 16 367
One year prior 455 778
Two years prior 812 548
Three years prior 552 206
Four years prior 205 27
Prior 50 24
Revolving Loans Amortized Cost Basis 32 32
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 5
Total 2,122 1,987
Commercial Loans | Construction | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 16 367
One year prior 451 764
Two years prior 798 510
Three years prior 501 188
Four years prior 187 27
Prior 49 22
Revolving Loans Amortized Cost Basis 31 31
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 5
Total 2,033 1,914
Commercial Loans | Construction | Criticized (Accruing)    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 0 0
One year prior 4 14
Two years prior 14 38
Three years prior 51 18
Four years prior 18 0
Prior 1 2
Revolving Loans Amortized Cost Basis 1 1
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 89 73
Commercial Loans | Construction | Criticized (Nonaccruing)    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 0 0
One year prior 0 0
Two years prior 0 0
Three years prior 0 0
Four years prior 0 0
Prior 0 0
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 0 0
Commercial Loans | Commercial lease financing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 152 1,086
One year prior 973 1,087
Two years prior 968 551
Three years prior 479 532
Four years prior 444 237
Prior 1,088 906
Revolving Loans Amortized Cost Basis 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 4,104 4,399
Commercial Loans | Commercial lease financing | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 152 1,076
One year prior 952 1,050
Two years prior 931 534
Three years prior 462 504
Four years prior 416 228
Prior 1,077 901
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 3,990 4,293
Commercial Loans | Commercial lease financing | Criticized (Accruing)    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 0 10
One year prior 21 35
Two years prior 35 15
Three years prior 15 26
Four years prior 26 7
Prior 9 4
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total 106 97
Commercial Loans | Commercial lease financing | Criticized (Nonaccruing)    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current 0 0
One year prior 0 2
Two years prior 2 2
Three years prior 2 2
Four years prior 2 2
Prior 2 1
Revolving Loans Amortized Cost Basis 0 0
Revolving Loans Converted to Term Loans Amortized Cost Basis 0 0
Total $ 8 $ 9