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Investment Securities - Amortized Cost, Fair Value and Yield by Maturity Date (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Amortized Cost          
Amortized Cost $ 80,025   $ 80,025   $ 84,045
Fair Value          
Fair Value $ 71,415   $ 71,415   $ 74,088
Weighted- Average Maturity in Years          
Total     8 years 2 months 12 days    
Weighted-Average Yield          
Total 2.20%   2.20%   2.22%
Weighted average maturity of total held to maturity investment securities         8 years 8 months 12 days
Amortized Cost          
Amortized Cost $ 86,873   $ 86,873    
Fair Value          
Fair Value [1] $ 81,704   $ 81,704   $ 69,706
Weighted- Average Maturity in Years          
Total     6 years   6 years 3 months 18 days
Weighted-Average Yield          
Total 3.26%   3.26%   3.12%
Federal statutory rate 21.00% 21.00% 21.00% 21.00%  
Portfolio basis adjustments excluded from amortized cost $ 525   $ 525    
U.S. Treasury and agencies          
Amortized Cost          
Maturing in one year or less 650   650    
Maturing after one year through five years 646   646    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Amortized Cost 1,296   1,296   $ 1,345
Fair Value          
Maturing in one year or less 644   644    
Maturing after one year through five years 636   636    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Fair Value $ 1,280   $ 1,280   1,310
Weighted- Average Maturity in Years          
Maturing in one year or less     7 months 6 days    
Maturing after one year through five years     2 years 7 months 6 days    
Total     1 year 7 months 6 days    
Weighted-Average Yield          
Maturing in one year or less 2.71%   2.71%    
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 2.85%   2.85%    
Maturing in one year or less     2 months 12 days    
Amortized Cost          
Maturing in one year or less $ 11   $ 11    
Maturing after one year through five years 15,218   15,218    
Maturing after five years through ten years 15,215   15,215    
Maturing after ten years 757   757    
Amortized Cost 31,201   31,201    
Fair Value          
Maturing in one year or less 11   11    
Maturing after one year through five years 14,601   14,601    
Maturing after five years through ten years 14,187   14,187    
Maturing after ten years 600   600    
Fair Value $ 29,399   $ 29,399   19,542
Weighted- Average Maturity in Years          
Maturing in one year or less     2 months 12 days    
Maturing after one year through five years     3 years 6 months    
Maturing after five years through ten years     6 years 8 months 12 days    
Maturing after ten years     10 years 9 months 18 days    
Total     5 years 2 months 12 days    
Weighted-Average Yield          
Maturing in one year or less 5.14%   5.14%    
Maturing after one year through five years 2.40%   2.40%    
Maturing after five years through ten years 2.73%   2.73%    
Maturing after ten years 1.92%   1.92%    
Total 2.55%   2.55%    
Mortgage-backed securities          
Amortized Cost          
Maturing in one year or less $ 40   $ 40    
Maturing after one year through five years 2,148   2,148    
Maturing after five years through ten years 76,190   76,190    
Maturing after ten years 109   109    
Amortized Cost 78,487   78,487    
Fair Value          
Maturing in one year or less 40   40    
Maturing after one year through five years 2,179   2,179    
Maturing after five years through ten years 67,559   67,559    
Maturing after ten years 112   112    
Fair Value $ 69,890   $ 69,890    
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 4 months 24 days    
Maturing after ten years     11 years    
Total     8 years 3 months 18 days    
Weighted-Average Yield          
Maturing in one year or less 4.47%   4.47%    
Maturing after one year through five years 4.55%   4.55%    
Maturing after five years through ten years 2.11%   2.11%    
Maturing after ten years 4.49%   4.49%    
Total 2.18%   2.18%    
Maturing in one year or less     8 months 12 days    
Amortized Cost          
Maturing in one year or less $ 39   $ 39    
Maturing after one year through five years 13,326   13,326    
Maturing after five years through ten years 24,261   24,261    
Maturing after ten years 309   309    
Amortized Cost 37,935   37,935    
Fair Value          
Maturing in one year or less 39   39    
Maturing after one year through five years 13,123   13,123    
Maturing after five years through ten years 21,924   21,924    
Maturing after ten years 292   292    
Fair Value $ 35,378   $ 35,378    
Weighted- Average Maturity in Years          
Maturing in one year or less     8 months 12 days    
Maturing after one year through five years     3 years 9 months 18 days    
Maturing after five years through ten years     7 years 1 month 6 days    
Maturing after ten years     11 years 6 months    
Total     6 years    
Weighted-Average Yield          
Maturing in one year or less 2.11%   2.11%    
Maturing after one year through five years 4.29%   4.29%    
Maturing after five years through ten years 2.93%   2.93%    
Maturing after ten years 5.64%   5.64%    
Total 3.42%   3.42%    
Asset-backed securities          
Amortized Cost          
Maturing in one year or less $ 0   $ 0    
Maturing after one year through five years 4,147   4,147    
Maturing after five years through ten years 2,610   2,610    
Maturing after ten years 0   0    
Amortized Cost 6,757   6,757    
Fair Value          
Maturing in one year or less 0   0    
Maturing after one year through five years 4,170   4,170    
Maturing after five years through ten years 2,618   2,618    
Maturing after ten years 0   0    
Fair Value $ 6,788   $ 6,788   6,724
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 10 months 24 days    
Total     3 years 4 months 24 days    
Weighted-Average Yield          
Maturing in one year or less 0.00%   0.00%    
Maturing after one year through five years 4.98%   4.98%    
Maturing after five years through ten years 6.53%   6.53%    
Maturing after ten years 0.00%   0.00%    
Total 5.58%   5.58%    
Obligations of state and political subdivisions          
Weighted-Average Yield          
Maturing in one year or less     6 months    
Amortized Cost          
Maturing in one year or less $ 284   $ 284    
Maturing after one year through five years 3,111   3,111    
Maturing after five years through ten years 1,546   1,546    
Maturing after ten years 5,791   5,791    
Amortized Cost 10,732   10,732    
Fair Value          
Maturing in one year or less 283   283    
Maturing after one year through five years 3,103   3,103    
Maturing after five years through ten years 1,491   1,491    
Maturing after ten years 5,011   5,011    
Fair Value $ 9,888   $ 9,888   9,989
Weighted- Average Maturity in Years          
Maturing in one year or less     6 months    
Maturing after one year through five years     2 years 7 months 6 days    
Maturing after five years through ten years     7 years 2 months 12 days    
Maturing after ten years     14 years 10 months 24 days    
Total     9 years 10 months 24 days    
Weighted-Average Yield          
Maturing in one year or less 5.10%   5.10%    
Maturing after one year through five years 4.57%   4.57%    
Maturing after five years through ten years 3.49%   3.49%    
Maturing after ten years 2.41%   2.41%    
Total 3.25%   3.25%    
Other          
Amortized Cost          
Maturing in one year or less $ 17   $ 17    
Maturing after one year through five years 225   225    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Amortized Cost 242   242   8
Fair Value          
Maturing in one year or less 17   17    
Maturing after one year through five years 228   228    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Fair Value $ 245   $ 245   8
Weighted- Average Maturity in Years          
Maturing in one year or less     6 months    
Maturing after one year through five years     2 years 6 months    
Total     2 years 4 months 24 days    
Weighted-Average Yield          
Maturing in one year or less 3.24%   3.24%    
Maturing after one year through five years 2.71%   2.71%    
Maturing after five years through ten years 0.00%   0.00%    
Maturing after ten years 0.00%   0.00%    
Total 2.75%   2.75%    
Maturing in one year or less     10 months 24 days    
Amortized Cost          
Maturing in one year or less $ 49   $ 49    
Maturing after one year through five years 199   199    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Amortized Cost 248   248    
Fair Value          
Maturing in one year or less 49   49    
Maturing after one year through five years 202   202    
Maturing after five years through ten years 0   0    
Maturing after ten years 0   0    
Fair Value $ 251   $ 251   $ 24
Weighted- Average Maturity in Years          
Maturing in one year or less     10 months 24 days    
Maturing after one year through five years     2 years    
Total     1 year 8 months 12 days    
Weighted-Average Yield          
Maturing in one year or less 4.66%   4.66%    
Maturing after one year through five years 5.01%   5.01%    
Maturing after five years through ten years 0.00%   0.00%    
Maturing after ten years 0.00%   0.00%    
Total 4.94%   4.94%    
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.