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
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]    
Due in one year or less, amount $ 66  
Due in one year or less, yield 1.87%  
Due after one year through five years, amount $ 81  
Due after one year through five years, yield 3.29%  
Due after five years through ten years, amount $ 17,188  
Due after five years though ten years, yield 1.86%  
Due after ten years, amount $ 321,083  
Due after ten years, yield 2.71%  
Amortized cost $ 338,418 $ 215,730
Total, yield 2.67%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Debt securities carried at fair value $ 245,997 256,467
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Due in one year or less, amount 65  
Due after one year through five years, amount 83  
Due after five years though ten years, amount 17,442  
Due after ten years, amount 330,327  
Held-to-maturity, fair value 347,917 $ 219,821
Mortgage-backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 26  
Due in one year or less, yield 3.08%  
Due after one year through five years, amount $ 6,143  
Due after one year through five years, yield 2.49%  
Due after five years through ten years, amount $ 8,108  
Due after five years through ten years, yield 2.45%  
Due after ten years, amount $ 76,479  
Due after ten years, yield 3.44%  
Total, amount $ 90,756  
Total, yield 3.29%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 26  
Due after one year through five years, amount 6,499  
Due after five years though ten years, amount 8,696  
Due after ten years, amount 79,191  
Debt securities carried at fair value 94,412  
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 $ 7  
Due after one year through five years, yield 5.37%  
Due after five years through ten years, amount $ 59  
Due after five years through ten years, yield 4.51%  
Due after ten years, amount $ 67,500  
Due after ten years, yield 3.36%  
Total, amount $ 67,566  
Total, yield 3.36%  
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 8  
Due after five years though ten years, amount 63  
Due after ten years, amount 69,793  
Debt securities carried at fair value 69,864  
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 $ 24  
Due after five years through ten years, yield 2.54%  
Due after ten years, amount $ 5,639  
Due after ten years, yield 2.95%  
Total, amount $ 5,663  
Total, yield 2.95%  
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 25  
Due after ten years, amount 5,812  
Debt securities carried at fair value 5,837  
Commercial    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 26  
Due in one year or less, yield 3.08%  
Due after one year through five years, amount $ 6,136  
Due after one year through five years, yield 2.49%  
Due after five years through ten years, amount $ 8,014  
Due after five years through ten years, yield 2.44%  
Due after ten years, amount $ 1,027  
Due after ten years, yield 2.75%  
Total, amount $ 15,203  
Total, yield 2.48%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 26  
Due after one year through five years, amount 6,491  
Due after five years though ten years, amount 8,586  
Due after ten years, amount 1,117  
Debt securities carried at fair value 16,220  
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 $ 11  
Due after five years through ten years, yield 0.00%  
Due after ten years, amount $ 2,313  
Due after ten years, yield 7.35%  
Total, amount $ 2,324  
Total, yield 7.32%  
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 22  
Due after ten years, amount 2,469  
Debt securities carried at fair value 2,491  
U.S. Treasury and agency securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 10,398  
Due in one year or less, yield 1.19%  
Due after one year through five years, amount $ 29,682  
Due after one year through five years, yield 1.81%  
Due after five years through ten years, amount $ 60,399  
Due after five years through ten years, yield 0.78%  
Due after ten years, amount $ 32  
Due after ten years, yield 2.62%  
Total, amount $ 100,511  
Total, yield 1.13%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 10,452  
Due after one year through five years, amount 31,020  
Due after five years though ten years, amount 61,377  
Due after ten years, amount 32  
Debt securities carried at fair value 102,881  
Non-U.S. securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 25,784  
Due in one year or less, yield 0.37%  
Due after one year through five years, amount $ 1,275  
Due after one year through five years, yield 1.50%  
Due after five years through ten years, amount $ 7  
Due after five years through ten years, yield 5.82%  
Due after ten years, amount $ 76  
Due after ten years, yield 8.89%  
Total, amount $ 27,142  
Total, yield 0.44%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 26,066  
Due after one year through five years, amount 1,278  
Due after five years though ten years, amount 8  
Due after ten years, amount 79  
Debt securities carried at fair value 27,431  
Other taxable securities, substantially all asset-backed securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 1,107  
Due in one year or less, yield 1.42%  
Due after one year through five years, amount $ 1,423  
Due after one year through five years, yield 2.32%  
Due after five years through ten years, amount $ 628  
Due after five years through ten years, yield 2.06%  
Due after ten years, amount $ 470  
Due after ten years, yield 1.73%  
Total, amount $ 3,628  
Total, yield 1.92%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 1,112  
Due after one year through five years, amount 1,445  
Due after five years though ten years, amount 640  
Due after ten years, amount 482  
Debt securities carried at fair value 3,679  
Total taxable securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 37,315  
Due in one year or less, yield 0.63%  
Due after one year through five years, amount $ 38,523  
Due after one year through five years, yield 1.93%  
Due after five years through ten years, amount $ 69,142  
Due after five years through ten years, yield 0.99%  
Due after ten years, amount $ 77,057  
Due after ten years, yield 3.44%  
Total, amount $ 222,037  
Total, yield 1.94%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 37,656  
Due after one year through five years, amount 40,242  
Due after five years though ten years, amount 70,721  
Due after ten years, amount 79,784  
Debt securities carried at fair value 228,403  
Tax-exempt securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 905  
Due in one year or less, yield 0.92%  
Due after one year through five years, amount $ 8,462  
Due after one year through five years, yield 1.23%  
Due after five years through ten years, amount $ 5,051  
Due after five years through ten years, yield 1.66%  
Due after ten years, amount $ 2,881  
Due after ten years, yield 1.53%  
Total, amount $ 17,299  
Total, yield 1.39%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 907  
Due after one year through five years, amount 8,548  
Due after five years though ten years, amount 5,201  
Due after ten years, amount 2,938  
Debt securities carried at fair value 17,594  
Debt securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 38,220  
Due in one year or less, yield 0.64%  
Due after one year through five years, amount $ 46,985  
Due after one year through five years, yield 1.80%  
Due after five years through ten years, amount $ 74,193  
Due after five years through ten years, yield 1.03%  
Due after ten years, amount $ 79,938  
Due after ten years, yield 3.37%  
Total, amount $ 239,336  
Total, yield 1.90%  
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]    
Due in one year or less, amount $ 38,563  
Due after one year through five years, amount 48,790  
Due after five years though ten years, amount 75,922  
Due after ten years, amount 82,722  
Debt securities carried at fair value $ 245,997