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Investment Securities - Amortized Cost, Fair Value and Yield by Maturity Date (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Amortized Cost      
Amortized Cost [1] $ 78,008   $ 78,634
Fair Value      
Fair Value $ 67,099   $ 66,275
Weighted- Average Maturity in Years      
Total 8 years 4 months 24 days    
Weighted-Average Yield      
Total 2.23%   2.20%
Weighted average maturity of total held to maturity investment securities     8 years 8 months 12 days
Amortized Cost      
Amortized Cost $ 92,863    
Fair Value      
Fair Value [1] $ 86,774   $ 85,992
Weighted- Average Maturity in Years      
Total 6 years 7 months 6 days   6 years 9 months 18 days
Weighted-Average Yield      
Total 3.54%   3.67%
Federal statutory rate 21.00% 21.00%  
Portfolio basis adjustments excluded from amortized cost $ 204    
U.S. Treasury and agencies      
Amortized Cost      
Maturing in one year or less 650    
Maturing after one year through five years 647    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Amortized Cost 1,297   $ 1,296
Fair Value      
Maturing in one year or less 649    
Maturing after one year through five years 635    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Fair Value $ 1,284   1,275
Weighted- Average Maturity in Years      
Maturing in one year or less 1 month 6 days    
Maturing after one year through five years 2 years 1 month 6 days    
Total 1 year 1 month 6 days    
Weighted-Average Yield      
Maturing in one year or less 2.71%    
Maturing after one year through five years 3.00%    
Maturing after five years through ten years 0.00%    
Maturing after ten years 0.00%    
Total 2.85%    
Maturing in one year or less 2 months 12 days    
Amortized Cost      
Maturing in one year or less $ 11    
Maturing after one year through five years 14,787    
Maturing after five years through ten years 15,077    
Maturing after ten years 512    
Amortized Cost 30,387    
Fair Value      
Maturing in one year or less 11    
Maturing after one year through five years 14,198    
Maturing after five years through ten years 14,018    
Maturing after ten years 389    
Fair Value $ 28,616   28,387
Weighted- Average Maturity in Years      
Maturing in one year or less 2 months 12 days    
Maturing after one year through five years 3 years    
Maturing after five years through ten years 6 years 3 months 18 days    
Maturing after ten years 10 years 6 months    
Total 4 years 9 months 18 days    
Weighted-Average Yield      
Maturing in one year or less 4.44%    
Maturing after one year through five years 2.57%    
Maturing after five years through ten years 3.02%    
Maturing after ten years 1.78%    
Total 2.78%    
Mortgage-backed securities      
Amortized Cost      
Maturing in one year or less $ 144    
Maturing after one year through five years 2,010    
Maturing after five years through ten years 74,273    
Maturing after ten years 45    
Amortized Cost 76,472    
Fair Value      
Maturing in one year or less 144    
Maturing after one year through five years 2,017    
Maturing after five years through ten years 63,367    
Maturing after ten years 45    
Fair Value $ 65,573    
Weighted- Average Maturity in Years      
Maturing in one year or less 9 months 18 days    
Maturing after one year through five years 3 years 6 months    
Maturing after five years through ten years 8 years 8 months 12 days    
Maturing after ten years 11 years 4 months 24 days    
Total 8 years 6 months    
Weighted-Average Yield      
Maturing in one year or less 4.70%    
Maturing after one year through five years 4.47%    
Maturing after five years through ten years 2.16%    
Maturing after ten years 4.23%    
Total 2.22%    
Maturing in one year or less 6 months    
Amortized Cost      
Maturing in one year or less $ 23    
Maturing after one year through five years 7,627    
Maturing after five years through ten years 36,268    
Maturing after ten years 271    
Amortized Cost 44,189    
Fair Value      
Maturing in one year or less 23    
Maturing after one year through five years 7,161    
Maturing after five years through ten years 33,742    
Maturing after ten years 258    
Fair Value $ 41,184    
Weighted- Average Maturity in Years      
Maturing in one year or less 6 months    
Maturing after one year through five years 4 years    
Maturing after five years through ten years 7 years 3 months 18 days    
Maturing after ten years 11 years 3 months 18 days    
Total 6 years 9 months 18 days    
Weighted-Average Yield      
Maturing in one year or less 1.89%    
Maturing after one year through five years 2.73%    
Maturing after five years through ten years 3.98%    
Maturing after ten years 5.39%    
Total 3.77%    
Asset-backed securities      
Amortized Cost      
Maturing in one year or less $ 10    
Maturing after one year through five years 3,159    
Maturing after five years through ten years 4,154    
Maturing after ten years 0    
Amortized Cost 7,323    
Fair Value      
Maturing in one year or less 10    
Maturing after one year through five years 3,169    
Maturing after five years through ten years 4,153    
Maturing after ten years 0    
Fair Value $ 7,332   7,165
Weighted- Average Maturity in Years      
Maturing after one year through five years 1 year 8 months 12 days    
Maturing after five years through ten years 5 years 9 months 18 days    
Total 4 years    
Weighted-Average Yield      
Maturing in one year or less 7.40%    
Maturing after one year through five years 4.83%    
Maturing after five years through ten years 5.76%    
Maturing after ten years 0.00%    
Total 5.36%    
Obligations of state and political subdivisions      
Weighted-Average Yield      
Maturing in one year or less 4 months 24 days    
Amortized Cost      
Maturing in one year or less $ 118    
Maturing after one year through five years 928    
Maturing after five years through ten years 1,200    
Maturing after ten years 8,404    
Amortized Cost 10,650    
Fair Value      
Maturing in one year or less 117    
Maturing after one year through five years 922    
Maturing after five years through ten years 1,125    
Maturing after ten years 7,162    
Fair Value $ 9,326   9,552
Weighted- Average Maturity in Years      
Maturing in one year or less 4 months 24 days    
Maturing after one year through five years 2 years 7 months 6 days    
Maturing after five years through ten years 7 years 7 months 6 days    
Maturing after ten years 14 years 8 months 12 days    
Total 12 years 8 months 12 days    
Weighted-Average Yield      
Maturing in one year or less 5.07%    
Maturing after one year through five years 4.70%    
Maturing after five years through ten years 3.68%    
Maturing after ten years 3.31%    
Total 3.49%    
Other      
Amortized Cost      
Maturing in one year or less $ 0    
Maturing after one year through five years 239    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Amortized Cost 239   244
Fair Value      
Maturing in one year or less 0    
Maturing after one year through five years 242    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Fair Value $ 242   247
Weighted- Average Maturity in Years      
Maturing after one year through five years 2 years 2 months 12 days    
Total 2 years 2 months 12 days    
Weighted-Average Yield      
Maturing in one year or less 0.00%    
Maturing after one year through five years 2.68%    
Maturing after five years through ten years 0.00%    
Maturing after ten years 0.00%    
Total 2.68%    
Maturing in one year or less 8 months 12 days    
Amortized Cost      
Maturing in one year or less $ 109    
Maturing after one year through five years 205    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Amortized Cost 314    
Fair Value      
Maturing in one year or less 109    
Maturing after one year through five years 207    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Fair Value $ 316   $ 250
Weighted- Average Maturity in Years      
Maturing in one year or less 8 months 12 days    
Maturing after one year through five years 2 years 4 months 24 days    
Total 1 year 9 months 18 days    
Weighted-Average Yield      
Maturing in one year or less 4.87%    
Maturing after one year through five years 4.65%    
Maturing after five years through ten years 0.00%    
Maturing after ten years 0.00%    
Total 4.72%    
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.