v3.25.2
Investment Securities - Amortized Cost and Estimated Fair Value by Contractual Maturity (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Available-for-sale securities, Amortized cost    
Due in one year or less $ 36,967  
Due after one year through five years 243,220  
Due after five years through 10 years 68,343  
Due after 10 years 139,006  
Amortized cost 487,536  
Available-for-sale securities, Fair value    
Due in one year or less 36,950  
Due after one year through five years 244,903  
Due after five years through 10 years 68,448  
Due after 10 years 135,079  
Fair value $ 485,380 $ 406,852
Available-for-sale securities, Average yield    
Due in one year or less 4.38%  
Due after one year through five years 4.46%  
Due after five years through 10 years 4.63%  
Due after 10 years 4.85%  
Average yield 4.59%  
Total held-to-maturity securities, Amortized cost    
Due in one year or less $ 32,839  
Due after one year through five years 38,009  
Due after five years through 10 years 74,554  
Due after 10 years 115,230  
Amortized cost 260,632  
Total held-to-maturity securities, Fair value    
Due in one year or less 32,278  
Due after one year through five years 35,822  
Due after five years through 10 years 68,115  
Due after 10 years 103,049  
Fair value $ 239,264 247,900
Total held-to-maturity securities, Average yield    
Due in one year or less 0.65%  
Due after one year through five years 1.57%  
Due after five years through 10 years 2.47%  
Due after 10 years 3.24%  
Average yield 2.45%  
Supplemental information    
Available for sale securities allowance for credit losses $ 35  
Unallocated portfolio layer fair value hedge basis adjustments 1,100  
Held-to-maturity securities allowance for credit losses $ 73  
US government agencies and US government sponsored enterprises residential MBS estimated duration 8 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 $ 1,237  
Due after one year through five years 9,871  
Due after five years through 10 years 5,075  
Due after 10 years 90,932  
Amortized cost 107,115  
Available-for-sale securities, Fair value    
Due in one year or less 1,227  
Due after one year through five years 9,969  
Due after five years through 10 years 5,126  
Due after 10 years 88,536  
Fair value $ 104,858 100,769
Available-for-sale securities, Average yield    
Due in one year or less 3.46%  
Due after one year through five years 4.68%  
Due after five years through 10 years 5.20%  
Due after 10 years 4.68%  
Average yield 4.69%  
Total held-to-maturity securities, Amortized cost    
Due in one year or less $ 356  
Due after one year through five years 8,129  
Due after five years through 10 years 6,967  
Due after 10 years 93,722  
Amortized cost 109,174  
Total held-to-maturity securities, Fair value    
Due in one year or less 347  
Due after one year through five years 7,727  
Due after five years through 10 years 6,287  
Due after 10 years 82,530  
Fair value $ 96,891 99,809
Total held-to-maturity securities, Average yield    
Due in one year or less 0.92%  
Due after one year through five years 2.60%  
Due after five years through 10 years 2.82%  
Due after 10 years 2.94%  
Average yield 2.90%  
U.S. Treasury and government agencies    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 25,637  
Due after one year through five years 216,412  
Due after five years through 10 years 53,105  
Due after 10 years 6,209  
Amortized cost 301,363  
Available-for-sale securities, Fair value    
Due in one year or less 25,649  
Due after one year through five years 217,910  
Due after five years through 10 years 53,225  
Due after 10 years 6,297  
Fair value $ 303,081 234,779
Available-for-sale securities, Average yield    
Due in one year or less 4.64%  
Due after one year through five years 4.46%  
Due after five years through 10 years 4.80%  
Due after 10 years 5.29%  
Average yield 4.55%  
Total held-to-maturity securities, Amortized cost    
Due in one year or less $ 32,483  
Due after one year through five years 29,681  
Due after five years through 10 years 46,072  
Due after 10 years 0  
Amortized cost 108,236  
Total held-to-maturity securities, Fair value    
Due in one year or less 31,931  
Due after one year through five years 27,900  
Due after five years through 10 years 40,329  
Due after 10 years 0  
Fair value $ 100,160 97,420
Total held-to-maturity securities, Average yield    
Due in one year or less 0.65%  
Due after one year through five years 1.27%  
Due after five years through 10 years 1.27%  
Due after 10 years 0.00%  
Average yield 1.08%  
Obligations of U.S. states and municipalities    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 1  
Due after one year through five years 14  
Due after five years through 10 years 93  
Due after 10 years 19,125  
Amortized cost 19,233  
Available-for-sale securities, Fair value    
Due in one year or less 1  
Due after one year through five years 14  
Due after five years through 10 years 92  
Due after 10 years 17,540  
Fair value $ 17,647 17,913
Available-for-sale securities, Average yield    
Due in one year or less 3.47%  
Due after one year through five years 3.85%  
Due after five years through 10 years 4.35%  
Due after 10 years 5.27%  
Average yield 5.26%  
Total held-to-maturity securities, Amortized cost    
Due in one year or less $ 0  
Due after one year through five years 44  
Due after five years through 10 years 278  
Due after 10 years 8,729  
Amortized cost 9,051  
Total held-to-maturity securities, Fair value    
Due in one year or less 0  
Due after one year through five years 40  
Due after five years through 10 years 256  
Due after 10 years 7,757  
Fair value $ 8,053 8,711
Total held-to-maturity securities, Average yield    
Due in one year or less 0.00%  
Due after one year through five years 4.55%  
Due after five years through 10 years 3.09%  
Due after 10 years 3.91%  
Average yield 3.88%  
Non-U.S. government debt securities    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 10,038  
Due after one year through five years 16,441  
Due after five years through 10 years 8,918  
Due after 10 years 5,786  
Amortized cost 41,183  
Available-for-sale securities, Fair value    
Due in one year or less 10,051  
Due after one year through five years 16,526  
Due after five years through 10 years 8,846  
Due after 10 years 5,707  
Fair value $ 41,130 36,245
Available-for-sale securities, Average yield    
Due in one year or less 3.74%  
Due after one year through five years 4.19%  
Due after five years through 10 years 3.16%  
Due after 10 years 3.92%  
Average yield 3.82%  
Corporate debt securities    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 49  
Due after one year through five years 106  
Due after five years through 10 years 0  
Due after 10 years 0  
Amortized cost 155  
Available-for-sale securities, Fair value    
Due in one year or less 17  
Due after one year through five years 106  
Due after five years through 10 years 0  
Due after 10 years 0  
Fair value $ 123 $ 70
Available-for-sale securities, Average yield    
Due in one year or less 17.50%  
Due after one year through five years 14.52%  
Due after five years through 10 years 0.00%  
Due after 10 years 0.00%  
Average yield 15.46%  
Asset-backed securities    
Available-for-sale securities, Amortized cost    
Due in one year or less $ 5  
Due after one year through five years 376  
Due after five years through 10 years 1,152  
Due after 10 years 16,954  
Amortized cost 18,487  
Available-for-sale securities, Fair value    
Due in one year or less 5  
Due after one year through five years 378  
Due after five years through 10 years 1,159  
Due after 10 years 16,999  
Fair value $ 18,541  
Available-for-sale securities, Average yield    
Due in one year or less 5.34%  
Due after one year through five years 5.76%  
Due after five years through 10 years 5.66%  
Due after 10 years 5.47%  
Average yield 5.49%  
Total held-to-maturity securities, Amortized cost    
Due in one year or less $ 0  
Due after one year through five years 155  
Due after five years through 10 years 21,237  
Due after 10 years 12,779  
Amortized cost 34,171  
Total held-to-maturity securities, Fair value    
Due in one year or less 0  
Due after one year through five years 155  
Due after five years through 10 years 21,243  
Due after 10 years 12,762  
Fair value $ 34,160  
Total held-to-maturity securities, Average yield    
Due in one year or less 0.00%  
Due after one year through five years 3.58%  
Due after five years through 10 years 4.94%  
Due after 10 years 5.03%  
Average yield 4.97%