Quarterly report pursuant to Section 13 or 15(d)

Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details)

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Securities - Maturities of Debt Securities Carried at Fair Value and Held-to-maturity Debt Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 76  
Due in one year or less, yield 1.73%  
Due after one year through five years, amount $ 14,262  
Due after one year through five years, yield 1.98%  
Due after five years through ten years, amount $ 108,905  
Due after five years though ten years, yield 1.33%  
Due after ten years, amount $ 463,656  
Due after ten years, yield 2.16%  
Amortized Cost $ 586,899 $ 594,591
Total, yield 2.00%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value $ 323,119 276,852
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in One Year or Less 75  
Due after One Year through Five Years 12,851  
Due after Five Years through Ten Years 90,672  
Due after Ten Years 374,150  
Held-to-maturity, fair value 477,748 496,597
AFS securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 102,252  
Due in one year or less, yield 5.04%  
Due after one year through five years, amount $ 149,679  
Due after one year through five years, yield 3.69%  
Due after five years through ten years, amount $ 26,305  
Due after five years through ten years, yield 3.49%  
Due after ten years, amount $ 48,217  
Due after ten years, yield 4.57%  
Amount $ 326,453  
Total, yield 4.23%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 102,257  
Due after one year through five years, amount 148,965  
Due after five years though ten years, amount 25,743  
Due after ten years, amount 46,154  
Fair Value 323,119  
Mortgage-backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 32  
Due in one year or less, yield 3.03%  
Due after one year through five years, amount $ 1,944  
Due after one year through five years, yield 5.88%  
Due after five years through ten years, amount $ 7,457  
Due after five years through ten years, yield 3.92%  
Due after ten years, amount $ 42,766  
Due after ten years, yield 4.62%  
Amount $ 52,199  
Total, yield 4.57%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 32  
Due after one year through five years, amount 1,905  
Due after five years though ten years, amount 7,298  
Due after ten years, amount 40,874  
Fair Value 50,109  
Agency    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 4  
Due after one year through five years, yield 4.00%  
Due after five years through ten years, amount $ 8  
Due after five years through ten years, yield 3.13%  
Due after ten years, amount $ 37,959  
Due after ten years, yield 4.70%  
Amount $ 37,971  
Total, yield 4.70%  
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 0  
Due after one year through five years, yield 0.00%  
Due after five years through ten years, amount $ 11  
Due after five years though ten years, yield 2.73%  
Due after ten years, amount $ 457,830  
Due after ten years, yield 2.16%  
Amortized Cost $ 457,841 465,456
Total, yield 2.16%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due after one year through five years, amount 4  
Due after five years though ten years, amount 7  
Due after ten years, amount 36,501  
Fair Value 36,512  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in One Year or Less 0  
Due after One Year through Five Years 0  
Due after Five Years through Ten Years 10  
Due after Ten Years 369,326  
Held-to-maturity, fair value 369,336 386,526
Agency-collateralized mortgage obligations    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 0  
Due after one year through five years, yield 0.00%  
Due after five years through ten years, amount $ 0  
Due after five years through ten years, yield 0.00%  
Due after ten years, amount $ 2,661  
Due after ten years, yield 3.38%  
Amount $ 2,661  
Total, yield 3.38%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due after one year through five years, amount 0  
Due after five years though ten years, amount 0  
Due after ten years, amount 2,450  
Fair Value 2,450  
Commercial    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 32  
Due in one year or less, yield 3.03%  
Due after one year through five years, amount $ 1,940  
Due after one year through five years, yield 5.88%  
Due after five years through ten years, amount $ 7,449  
Due after five years through ten years, yield 3.92%  
Due after ten years, amount $ 1,570  
Due after ten years, yield 2.74%  
Amount $ 10,991  
Total, yield 4.09%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 32  
Due after one year through five years, amount 1,899  
Due after five years though ten years, amount 7,291  
Due after ten years, amount 1,364  
Fair Value 10,586  
Non-agency residential    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 0  
Due after one year through five years, yield 0.00%  
Due after five years through ten years, amount $ 0  
Due after five years through ten years, yield 0.00%  
Due after ten years, amount $ 576  
Due after ten years, yield 10.15%  
Amount $ 576  
Total, yield 10.15%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 0  
Due after one year through five years, amount 2  
Due after five years though ten years, amount 0  
Due after ten years, amount 559  
Fair Value 561  
U.S. Treasury and government agencies    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 82,297  
Due in one year or less, yield 5.29%  
Due after one year through five years, amount $ 135,534  
Due after one year through five years, yield 3.72%  
Due after five years through ten years, amount $ 13,857  
Due after five years through ten years, yield 2.75%  
Due after ten years, amount $ 37  
Due after ten years, yield 3.92%  
Amount $ 231,725  
Total, yield 4.21%  
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 0  
Due in one year or less, yield 0.00%  
Due after one year through five years, amount $ 13,043  
Due after one year through five years, yield 1.93%  
Due after five years through ten years, amount $ 108,615  
Due after five years though ten years, yield 1.32%  
Due after ten years, amount $ 0  
Due after ten years, yield 0.00%  
Amortized Cost $ 121,658 121,645
Total, yield 1.39%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 82,294  
Due after one year through five years, amount 134,902  
Due after five years though ten years, amount 13,502  
Due after ten years, amount 36  
Fair Value 230,734  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in One Year or Less 0  
Due after One Year through Five Years 11,695  
Due after Five Years through Ten Years 90,437  
Due after Ten Years 0  
Held-to-maturity, fair value 102,132 103,682
Non-U.S. securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 18,124  
Due in one year or less, yield 3.91%  
Due after one year through five years, amount $ 6,087  
Due after one year through five years, yield 1.49%  
Due after five years through ten years, amount $ 3,751  
Due after five years through ten years, yield 5.34%  
Due after ten years, amount $ 1,148  
Due after ten years, yield 5.09%  
Amount $ 29,110  
Total, yield 3.63%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 18,136  
Due after one year through five years, amount 6,089  
Due after five years though ten years, amount 3,750  
Due after ten years, amount 1,149  
Fair Value 29,124  
Other taxable securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 733  
Due in one year or less, yield 6.55%  
Due after one year through five years, amount $ 2,233  
Due after one year through five years, yield 6.11%  
Due after five years through ten years, amount $ 244  
Due after five years through ten years, yield 4.36%  
Due after ten years, amount $ 75  
Due after ten years, yield 2.82%  
Amount $ 3,285  
Total, yield 6.01%  
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 76  
Due in one year or less, yield 1.73%  
Due after one year through five years, amount $ 1,219  
Due after one year through five years, yield 2.58%  
Due after five years through ten years, amount $ 279  
Due after five years though ten years, yield 3.46%  
Due after ten years, amount $ 5,826  
Due after ten years, yield 2.49%  
Amortized Cost $ 7,400 7,490
Total, yield 2.54%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 730  
Due after one year through five years, amount 2,222  
Due after five years though ten years, amount 222  
Due after ten years, amount 68  
Fair Value 3,242  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in One Year or Less 75  
Due after One Year through Five Years 1,156  
Due after Five Years through Ten Years 225  
Due after Ten Years 4,824  
Held-to-maturity, fair value 6,280 $ 6,389
Tax-exempt securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 1,066  
Due in one year or less, yield 4.18%  
Due after one year through five years, amount $ 3,881  
Due after one year through five years, yield 3.65%  
Due after five years through ten years, amount $ 996  
Due after five years through ten years, yield 3.29%  
Due after ten years, amount $ 4,191  
Due after ten years, yield 4.02%  
Amount $ 10,134  
Total, yield 3.82%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 1,065  
Due after one year through five years, amount 3,847  
Due after five years though ten years, amount 971  
Due after ten years, amount 4,027  
Fair Value $ 9,910