Annual report pursuant to Section 13 and 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
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 37  
Due in one year or less, yield 5.31%  
Due after one year through five years, amount $ 1,035  
Due after one year through five years, yield 2.21%  
Due after five years through ten years, amount $ 112,336  
Due after five years though ten years, yield 1.35%  
Due after ten years, amount $ 561,183  
Due after ten years, yield 2.13%  
Amortized cost $ 674,591 $ 438,279
Total, yield 2.00%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Fair Value $ 308,073 246,601
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in one year or less, amount 37  
Due after one year through five years, amount 1,060  
Due after five years though ten years, amount 110,205  
Due after ten years, amount 554,588  
Held-to-maturity, fair value 665,890 448,180
Mortgage-backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 363  
Due in one year or less, yield 2.30%  
Due after one year through five years, amount $ 10,128  
Due after one year through five years, yield 2.48%  
Due after five years through ten years, amount $ 6,354  
Due after five years through ten years, yield 1.81%  
Due after ten years, amount $ 51,915  
Due after ten years, yield 3.11%  
Total, amount $ 68,760  
Total, yield 2.89%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 366  
Due after one year through five years, amount 10,571  
Due after five years though ten years, amount 6,452  
Due after ten years, amount 53,115  
Fair Value 70,504  
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 $ 5  
Due after one year through five years, yield 5.00%  
Due after five years through ten years, amount $ 49  
Due after five years through ten years, yield 4.63%  
Due after ten years, amount $ 45,214  
Due after ten years, yield 3.11%  
Total, amount $ 45,268  
Total, yield 3.11%  
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 $ 4  
Due after five years though ten years, yield 2.00%  
Due after ten years, amount $ 553,717  
Due after ten years, yield 2.13%  
Amortized cost $ 553,721 414,289
Total, yield 2.13%  
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 5  
Due after five years though ten years, amount 53  
Due after ten years, amount 46,281  
Fair Value 46,339  
Held-to-maturity Securities, Debt Maturities, Fair Value [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 4  
Due after ten years, amount 547,206  
Held-to-maturity, fair value 547,210 424,021
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 $ 20  
Due after five years through ten years, yield 2.50%  
Due after ten years, amount $ 3,311  
Due after ten years, yield 2.91%  
Total, amount $ 3,331  
Total, yield 2.91%  
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 20  
Due after ten years, amount 3,360  
Fair Value 3,380  
Commercial    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 363  
Due in one year or less, yield 2.30%  
Due after one year through five years, amount $ 10,123  
Due after one year through five years, yield 2.48%  
Due after five years through ten years, amount $ 6,285  
Due after five years through ten years, yield 1.79%  
Due after ten years, amount $ 2,278  
Due after ten years, yield 1.87%  
Total, amount $ 19,049  
Total, yield 2.18%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 366  
Due after one year through five years, amount 10,562  
Due after five years though ten years, amount 6,379  
Due after ten years, amount 2,310  
Fair Value 19,617  
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 $ 1,112  
Due after ten years, yield 6.43%  
Total, amount $ 1,112  
Total, yield 6.43%  
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 0  
Due after ten years, amount 1,164  
Fair Value 1,168  
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 $ 6,564  
Due in one year or less, yield 1.22%  
Due after one year through five years, amount $ 39,875  
Due after one year through five years, yield 1.80%  
Due after five years through ten years, amount $ 151,962  
Due after five years through ten years, yield 1.20%  
Due after ten years, amount $ 27  
Due after ten years, yield 2.61%  
Total, amount $ 198,428  
Total, yield 1.32%  
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 $ 111,859  
Due after five years though ten years, yield 1.35%  
Due after ten years, amount $ 0  
Due after ten years, yield 0.00%  
Amortized cost $ 111,859 16,084
Total, yield 1.35%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 6,614  
Due after one year through five years, amount 40,912  
Due after five years though ten years, amount 152,168  
Due after ten years, amount 26  
Fair Value 199,720  
Held-to-maturity Securities, Debt Maturities, Fair Value [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 109,718  
Due after ten years, amount 0  
Held-to-maturity, fair value 109,718 16,013
Non-U.S. securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 18,645  
Due in one year or less, yield 0.20%  
Due after one year through five years, amount $ 1,045  
Due after one year through five years, yield 3.61%  
Due after five years through ten years, amount $ 0  
Due after five years through ten years, yield 0.00%  
Due after ten years, amount $ 7  
Due after ten years, yield 9.15%  
Total, amount $ 19,697  
Total, yield 0.38%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 18,599  
Due after one year through five years, amount 1,046  
Due after five years though ten years, amount 0  
Due after ten years, amount 7  
Fair Value 19,652  
Other taxable securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 562  
Due in one year or less, yield 1.49%  
Due after one year through five years, amount $ 1,646  
Due after one year through five years, yield 1.97%  
Due after five years through ten years, amount $ 308  
Due after five years through ten years, yield 2.04%  
Due after ten years, amount $ 209  
Due after ten years, yield 1.76%  
Total, amount $ 2,725  
Total, yield 1.86%  
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 37  
Due in one year or less, yield 5.31%  
Due after one year through five years, amount $ 1,035  
Due after one year through five years, yield 2.21%  
Due after five years through ten years, amount $ 473  
Due after five years though ten years, yield 2.66%  
Due after ten years, amount $ 7,466  
Due after ten years, yield 2.51%  
Amortized cost $ 9,011 7,906
Total, yield 2.50%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 566  
Due after one year through five years, amount 1,676  
Due after five years though ten years, amount 310  
Due after ten years, amount 212  
Fair Value 2,764  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in one year or less, amount 37  
Due after one year through five years, amount 1,060  
Due after five years though ten years, amount 483  
Due after ten years, amount 7,382  
Held-to-maturity, fair value 8,962 $ 8,146
Tax-exempt securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 2,485  
Due in one year or less, yield 1.06%  
Due after one year through five years, amount $ 6,520  
Due after one year through five years, yield 1.42%  
Due after five years through ten years, amount $ 3,105  
Due after five years through ten years, yield 1.81%  
Due after ten years, amount $ 3,045  
Due after ten years, yield 1.46%  
Total, amount $ 15,155  
Total, yield 1.45%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 2,489  
Due after one year through five years, amount 6,660  
Due after five years though ten years, amount 3,223  
Due after ten years, amount 3,061  
Fair Value 15,433  
Debt securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 28,619  
Due in one year or less, yield 0.56%  
Due after one year through five years, amount $ 59,214  
Due after one year through five years, yield 1.89%  
Due after five years through ten years, amount $ 161,729  
Due after five years through ten years, yield 1.23%  
Due after ten years, amount $ 55,203  
Due after ten years, yield 3.02%  
Total, amount $ 304,765  
Total, yield 1.62%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 28,634  
Due after one year through five years, amount 60,865  
Due after five years though ten years, amount 162,153  
Due after ten years, amount 56,421  
Fair Value $ 308,073