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Investment Securities - Gross Unrealized Losses and Fair Values of Investments in Continuous Unrealized Loss Positions (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
AFS securities, Fair Value    
Less than 12 months $ 68,911 $ 115,791
12 months or more 9,655 3,655
Total 78,566 119,446
AFS securities, Unrealized Losses    
Less than 12 months 6,990 2,564
12 months or more 1,470 156
Total 8,460 2,720
U.S. Treasury    
AFS securities, Fair Value    
Less than 12 months 9,644 8,412
12 months or more 594 582
Total 10,238 8,994
AFS securities, Unrealized Losses    
Less than 12 months 541 88
12 months or more 56 18
Total 597 106
GSE    
AFS securities, Fair Value    
Less than 12 months 230 104
12 months or more 0 0
Total 230 104
AFS securities, Unrealized Losses    
Less than 12 months 19 2
12 months or more 0 0
Total 19 2
Agency MBS | Agency MBS - residential    
AFS securities, Fair Value    
Less than 12 months 54,268 101,262
12 months or more 7,489 2,638
Total 61,757 103,900
12 months or more 2,660  
12 months or more 19,901  
Less than 12 months 3,516  
Less than 12 months 34,004  
AFS securities, Unrealized Losses    
Less than 12 months 5,703 2,377
12 months or more 1,176 123
Total 6,879 2,500
Total 53,905  
Total 6,176  
Agency MBS | Commercial Mortgage Backed Securities    
AFS securities, Fair Value    
Less than 12 months 1,031 1,749
12 months or more 1,552 413
Total 2,583 2,162
AFS securities, Unrealized Losses    
Less than 12 months 79 50
12 months or more 235 14
Total 314 64
States and political subdivisions    
AFS securities, Fair Value    
Less than 12 months 198 0
12 months or more 20 22
Total 218 22
AFS securities, Unrealized Losses    
Less than 12 months 20 0
12 months or more 3 1
Total 23 1
Non-agency MBS    
AFS securities, Fair Value    
Less than 12 months 3,425 4,258
12 months or more 0 0
Total 3,425 4,258
AFS securities, Unrealized Losses    
Less than 12 months 625 47
12 months or more 0 0
Total 625 47
Other    
AFS securities, Fair Value    
Less than 12 months 115 6
12 months or more 0 0
Total 115 6
AFS securities, Unrealized Losses    
Less than 12 months 3 0
12 months or more 0 0
Total $ 3 $ 0