v3.26.1
Investment Securities - Amortized Cost and Estimated Fair Value by Contractual Maturity (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Available-for-sale securities, Amortized cost    
Due in one year or less $ 29,109  
Due after one year through five years 280,284  
Due after five years through 10 years 96,520  
Due after 10 years 133,289  
Amortized cost 539,202  
Available-for-sale securities, Fair value    
Due in one year or less 29,113  
Due after one year through five years 279,113  
Due after five years through 10 years 96,148  
Due after 10 years 131,674  
Fair value $ 536,048 $ 507,198
Available-for-sale securities, Average yield    
Due in one year or less 3.84%  
Due after one year through five years 4.06%  
Due after five years through 10 years 4.11%  
Due after 10 years 4.84%  
Average yield 4.25%  
Total held-to-maturity securities, Amortized cost    
Due in one year or less $ 25,896  
Due after one year through five years 125,745  
Due after five years through 10 years 14,775  
Due after 10 years 102,100  
Amortized cost 268,516  
Total held-to-maturity securities, Fair value    
Due in one year or less 25,768  
Due after one year through five years 118,049  
Due after five years through 10 years 14,329  
Due after 10 years 92,164  
Fair value $ 250,310 253,344
Total held-to-maturity securities, Average yield    
Due in one year or less 3.98%  
Due after one year through five years 2.32%  
Due after five years through 10 years 3.91%  
Due after 10 years 3.15%  
Average yield 2.89%  
Supplemental information    
Available for sale securities allowance for credit losses $ 21  
Unallocated portfolio layer fair value hedge basis adjustments (492)  
Held-to-maturity securities allowance for credit losses $ 42  
US government agencies and US government sponsored enterprises residential MBS estimated duration 7 years  
Agency residential collateralized mortgage obligations estimated duration 6 years  
Nonagency residential collateralized mortgage obligations estimated duration 5 years  
Minimum    
Supplemental information    
Due period of mortgage-backed securities and collateralized mortgage obligations 10 years  
Mortgage-backed securities    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 833  
Due after one year through five years 12,046  
Due after five years through 10 years 4,635  
Due after 10 years 82,821  
Amortized cost 100,335  
Available-for-sale securities, Fair value    
Due in one year or less 830  
Due after one year through five years 12,083  
Due after five years through 10 years 4,653  
Due after 10 years 81,480  
Fair value $ 99,046 101,447
Available-for-sale securities, Average yield    
Due in one year or less 2.88%  
Due after one year through five years 4.55%  
Due after five years through 10 years 4.48%  
Due after 10 years 4.82%  
Average yield 4.76%  
Total held-to-maturity securities, Amortized cost    
Due in one year or less $ 970  
Due after one year through five years 8,991  
Due after five years through 10 years 4,746  
Due after 10 years 82,953  
Amortized cost 97,660  
Total held-to-maturity securities, Fair value    
Due in one year or less 965  
Due after one year through five years 8,447  
Due after five years through 10 years 4,356  
Due after 10 years 73,442  
Fair value $ 87,210 93,186
Total held-to-maturity securities, Average yield    
Due in one year or less 2.19%  
Due after one year through five years 2.47%  
Due after five years through 10 years 3.27%  
Due after 10 years 2.88%  
Average yield 2.85%  
U.S. Treasury and government agencies    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 15,961  
Due after one year through five years 241,273  
Due after five years through 10 years 78,943  
Due after 10 years 6,374  
Amortized cost 342,551  
Available-for-sale securities, Fair value    
Due in one year or less 15,965  
Due after one year through five years 240,207  
Due after five years through 10 years 78,646  
Due after 10 years 6,397  
Fair value $ 341,215 315,822
Available-for-sale securities, Average yield    
Due in one year or less 4.01%  
Due after one year through five years 3.98%  
Due after five years through 10 years 4.16%  
Due after 10 years 4.49%  
Average yield 4.03%  
Total held-to-maturity securities, Amortized cost    
Due in one year or less $ 24,926  
Due after one year through five years 116,188  
Due after five years through 10 years 1,265  
Due after 10 years 0  
Amortized cost 142,379  
Total held-to-maturity securities, Fair value    
Due in one year or less 24,803  
Due after one year through five years 109,040  
Due after five years through 10 years 1,226  
Due after 10 years 0  
Fair value $ 135,069 126,447
Total held-to-maturity securities, Average yield    
Due in one year or less 4.05%  
Due after one year through five years 2.31%  
Due after five years through 10 years 3.20%  
Due after 10 years 0.00%  
Average yield 2.62%  
Obligations of U.S. states and municipalities    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 0  
Due after one year through five years 19  
Due after five years through 10 years 138  
Due after 10 years 18,902  
Amortized cost 19,059  
Available-for-sale securities, Fair value    
Due in one year or less 0  
Due after one year through five years 19  
Due after five years through 10 years 133  
Due after 10 years 18,564  
Fair value $ 18,716 20,240
Available-for-sale securities, Average yield    
Due in one year or less 0.00%  
Due after one year through five years 4.03%  
Due after five years through 10 years 3.95%  
Due after 10 years 5.09%  
Average yield 5.08%  
Total held-to-maturity securities, Amortized cost    
Due in one year or less $ 0  
Due after one year through five years 53  
Due after five years through 10 years 322  
Due after 10 years 7,774  
Amortized cost 8,149  
Total held-to-maturity securities, Fair value    
Due in one year or less 0  
Due after one year through five years 50  
Due after five years through 10 years 301  
Due after 10 years 7,359  
Fair value $ 7,710 8,008
Total held-to-maturity securities, Average yield    
Due in one year or less 0.00%  
Due after one year through five years 4.74%  
Due after five years through 10 years 3.38%  
Due after 10 years 4.05%  
Average yield 4.02%  
Non-U.S. government debt securities    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 12,307  
Due after one year through five years 26,519  
Due after five years through 10 years 11,555  
Due after 10 years 343  
Amortized cost 50,724  
Available-for-sale securities, Fair value    
Due in one year or less 12,314  
Due after one year through five years 26,384  
Due after five years through 10 years 11,465  
Due after 10 years 344  
Fair value $ 50,507 45,655
Available-for-sale securities, Average yield    
Due in one year or less 3.68%  
Due after one year through five years 4.48%  
Due after five years through 10 years 3.48%  
Due after 10 years 2.56%  
Average yield 4.05%  
Corporate debt securities    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 7  
Due after one year through five years 130  
Due after five years through 10 years 0  
Due after 10 years 0  
Amortized cost 137  
Available-for-sale securities, Fair value    
Due in one year or less 3  
Due after one year through five years 123  
Due after five years through 10 years 0  
Due after 10 years 0  
Fair value $ 126 $ 128
Available-for-sale securities, Average yield    
Due in one year or less 17.50%  
Due after one year through five years 15.06%  
Due after five years through 10 years 0.00%  
Due after 10 years 0.00%  
Average yield 15.18%  
Asset-backed securities    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 1  
Due after one year through five years 297  
Due after five years through 10 years 1,249  
Due after 10 years 24,849  
Amortized cost 26,396  
Available-for-sale securities, Fair value    
Due in one year or less 1  
Due after one year through five years 297  
Due after five years through 10 years 1,251  
Due after 10 years 24,889  
Fair value $ 26,438  
Available-for-sale securities, Average yield    
Due in one year or less 4.77%  
Due after one year through five years 5.33%  
Due after five years through 10 years 5.68%  
Due after 10 years 4.82%  
Average yield 4.87%  
Total held-to-maturity securities, Amortized cost    
Due in one year or less $ 0  
Due after one year through five years 513  
Due after five years through 10 years 8,442  
Due after 10 years 11,373  
Amortized cost 20,328  
Total held-to-maturity securities, Fair value    
Due in one year or less 0  
Due after one year through five years 512  
Due after five years through 10 years 8,446  
Due after 10 years 11,363  
Fair value $ 20,321  
Total held-to-maturity securities, Average yield    
Due in one year or less 0.00%  
Due after one year through five years 2.97%  
Due after five years through 10 years 4.40%  
Due after 10 years 4.52%  
Average yield 4.43%