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Investment Securities - Amortized Cost, Fair Value and Yield by Maturity Date (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Amortized Cost          
Amortized Cost [1] $ 77,879   $ 77,879   $ 78,634
Fair Value          
Fair Value $ 67,032   $ 67,032   $ 66,275
Weighted- Average Maturity in Years          
Total     8 years 3 months 18 days    
Weighted-Average Yield          
Total 2.30%   2.30%   2.20%
Weighted average maturity of total held to maturity investment securities         8 years 8 months 12 days
Amortized Cost          
Amortized Cost $ 96,301   $ 96,301    
Fair Value          
Fair Value [1] $ 90,577   $ 90,577   $ 85,992
Weighted- Average Maturity in Years          
Total     6 years 7 months 6 days   6 years 9 months 18 days
Weighted-Average Yield          
Total 3.58%   3.58%   3.67%
Federal statutory rate 21.00% 21.00% 21.00% 21.00%  
Portfolio basis adjustments excluded from amortized cost $ 314   $ 314    
U.S. Treasury and agencies          
Amortized Cost          
Maturing in one year or less 0   0    
Maturing after one year through five years 647   647    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Amortized Cost 647   647   $ 1,296
Fair Value          
Maturing in one year or less 0   0    
Maturing after one year through five years 638   638    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Fair Value $ 638   $ 638   1,275
Weighted- Average Maturity in Years          
Maturing after one year through five years     1 year 9 months 18 days    
Total     1 year 9 months 18 days    
Weighted-Average Yield          
Maturing in one year or less 0.00%   0.00%    
Maturing after one year through five years 3.00%   3.00%    
Maturing after five years through ten years 0.00%   0.00%    
Maturing after ten years 0.00%   0.00%    
Total 3.00%   3.00%    
Maturing in one year or less     1 month 6 days    
Amortized Cost          
Maturing in one year or less $ 11   $ 11    
Maturing after one year through five years 14,071   14,071    
Maturing after five years through ten years 15,317   15,317    
Maturing after ten years 391   391    
Amortized Cost 29,790   29,790    
Fair Value          
Maturing in one year or less 11   11    
Maturing after one year through five years 13,556   13,556    
Maturing after five years through ten years 14,252   14,252    
Maturing after ten years 298   298    
Fair Value $ 28,117   $ 28,117   28,387
Weighted- Average Maturity in Years          
Maturing in one year or less     1 month 6 days    
Maturing after one year through five years     2 years 10 months 24 days    
Maturing after five years through ten years     6 years 1 month 6 days    
Maturing after ten years     10 years 3 months 18 days    
Total     4 years 7 months 6 days    
Weighted-Average Yield          
Maturing in one year or less 4.43%   4.43%    
Maturing after one year through five years 2.38%   2.38%    
Maturing after five years through ten years 2.86%   2.86%    
Maturing after ten years 1.82%   1.82%    
Total 2.62%   2.62%    
Mortgage-backed securities          
Amortized Cost          
Maturing in one year or less $ 212   $ 212    
Maturing after one year through five years 1,935   1,935    
Maturing after five years through ten years 74,818   74,818    
Maturing after ten years 7   7    
Amortized Cost 76,972   76,972    
Fair Value          
Maturing in one year or less 213   213    
Maturing after one year through five years 1,953   1,953    
Maturing after five years through ten years 63,957   63,957    
Maturing after ten years 7   7    
Fair Value $ 66,130   $ 66,130    
Weighted- Average Maturity in Years          
Maturing in one year or less     8 months 12 days    
Maturing after one year through five years     3 years 6 months    
Maturing after five years through ten years     8 years 6 months    
Maturing after ten years     18 years 9 months 18 days    
Total     8 years 4 months 24 days    
Weighted-Average Yield          
Maturing in one year or less 4.74%   4.74%    
Maturing after one year through five years 4.48%   4.48%    
Maturing after five years through ten years 2.22%   2.22%    
Maturing after ten years 1.81%   1.81%    
Total 2.29%   2.29%    
Maturing in one year or less     10 months 24 days    
Amortized Cost          
Maturing in one year or less $ 267   $ 267    
Maturing after one year through five years 7,082   7,082    
Maturing after five years through ten years 40,787   40,787    
Maturing after ten years 267   267    
Amortized Cost 48,403   48,403    
Fair Value          
Maturing in one year or less 261   261    
Maturing after one year through five years 6,593   6,593    
Maturing after five years through ten years 38,648   38,648    
Maturing after ten years 253   253    
Fair Value $ 45,755   $ 45,755    
Weighted- Average Maturity in Years          
Maturing in one year or less     10 months 24 days    
Maturing after one year through five years     4 years 4 months 24 days    
Maturing after five years through ten years     7 years 3 months 18 days    
Maturing after ten years     11 years 1 month 6 days    
Total     6 years 9 months 18 days    
Weighted-Average Yield          
Maturing in one year or less 1.94%   1.94%    
Maturing after one year through five years 2.37%   2.37%    
Maturing after five years through ten years 4.24%   4.24%    
Maturing after ten years 5.36%   5.36%    
Total 3.96%   3.96%    
Asset-backed securities          
Weighted-Average Yield          
Maturing in one year or less     3 months 18 days    
Amortized Cost          
Maturing in one year or less $ 10   $ 10    
Maturing after one year through five years 2,841   2,841    
Maturing after five years through ten years 4,316   4,316    
Maturing after ten years 0   0    
Amortized Cost 7,167   7,167    
Fair Value          
Maturing in one year or less 10   10    
Maturing after one year through five years 2,851   2,851    
Maturing after five years through ten years 4,322   4,322    
Maturing after ten years 0   0    
Fair Value $ 7,183   $ 7,183   7,165
Weighted- Average Maturity in Years          
Maturing in one year or less     3 months 18 days    
Maturing after one year through five years     1 year 8 months 12 days    
Maturing after five years through ten years     5 years 7 months 6 days    
Total     4 years 1 month 6 days    
Weighted-Average Yield          
Maturing in one year or less 7.02%   7.02%    
Maturing after one year through five years 4.84%   4.84%    
Maturing after five years through ten years 5.66%   5.66%    
Maturing after ten years 0.00%   0.00%    
Total 5.34%   5.34%    
Obligations of state and political subdivisions          
Weighted-Average Yield          
Maturing in one year or less     3 months 18 days    
Amortized Cost          
Maturing in one year or less $ 148   $ 148    
Maturing after one year through five years 806   806    
Maturing after five years through ten years 1,112   1,112    
Maturing after ten years 8,565   8,565    
Amortized Cost 10,631   10,631    
Fair Value          
Maturing in one year or less 148   148    
Maturing after one year through five years 802   802    
Maturing after five years through ten years 1,042   1,042    
Maturing after ten years 7,217   7,217    
Fair Value $ 9,209   $ 9,209   9,552
Weighted- Average Maturity in Years          
Maturing in one year or less     3 months 18 days    
Maturing after one year through five years     2 years 6 months    
Maturing after five years through ten years     7 years 8 months 12 days    
Maturing after ten years     14 years 6 months    
Total     12 years 8 months 12 days    
Weighted-Average Yield          
Maturing in one year or less 4.61%   4.61%    
Maturing after one year through five years 4.75%   4.75%    
Maturing after five years through ten years 3.48%   3.48%    
Maturing after ten years 3.13%   3.13%    
Total 3.31%   3.31%    
Other          
Amortized Cost          
Maturing in one year or less $ 0   $ 0    
Maturing after one year through five years 260   260    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Amortized Cost 260   260   244
Fair Value          
Maturing in one year or less 0   0    
Maturing after one year through five years 264   264    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Fair Value $ 264   $ 264   247
Weighted- Average Maturity in Years          
Maturing after one year through five years     1 year 10 months 24 days    
Total     1 year 10 months 24 days    
Weighted-Average Yield          
Maturing in one year or less 0.00%   0.00%    
Maturing after one year through five years 2.68%   2.68%    
Maturing after five years through ten years 0.00%   0.00%    
Maturing after ten years 0.00%   0.00%    
Total 2.68%   2.68%    
Maturing in one year or less     6 months    
Amortized Cost          
Maturing in one year or less $ 124   $ 124    
Maturing after one year through five years 186   186    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Amortized Cost 310   310    
Fair Value          
Maturing in one year or less 125   125    
Maturing after one year through five years 188   188    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Fair Value $ 313   $ 313   $ 250
Weighted- Average Maturity in Years          
Maturing in one year or less     6 months    
Maturing after one year through five years     2 years 3 months 18 days    
Total     1 year 7 months 6 days    
Weighted-Average Yield          
Maturing in one year or less 4.95%   4.95%    
Maturing after one year through five years 4.57%   4.57%    
Maturing after five years through ten years 0.00%   0.00%    
Maturing after ten years 0.00%   0.00%    
Total 4.72%   4.72%    
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.