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Investment Securities - Amortized Cost, Fair Value and Yield by Maturity Date (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Amortized Cost      
Amortized Cost $ 78,634 $ 84,045  
Fair Value      
Fair Value $ 66,275 $ 74,088  
Weighted- Average Maturity in Years      
Total 8 years 8 months 12 days    
Weighted- Average Yield      
Total 2.20% 2.22%  
Weighted average maturity of total held to maturity investment securities   8 years 8 months 12 days  
Amortized Cost      
Amortized Cost $ 92,780    
Fair Value      
Fair Value [1] $ 85,992 $ 69,706  
Weighted- Average Maturity in Years      
Total 6 years 9 months 18 days 6 years 3 months 18 days  
Weighted- Average Yield      
Total 3.67% 3.12%  
Federal statutory rate 21.00% 21.00% 21.00%
Portfolio basis adjustments excluded from amortized cost $ 13    
U.S. Treasury and agencies      
Amortized Cost      
Maturing in one year or less 650    
Maturing after one year through five years 646    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Amortized Cost 1,296 $ 1,345  
Fair Value      
Maturing in one year or less 647    
Maturing after one year through five years 628    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Fair Value $ 1,275 1,310  
Weighted- Average Maturity in Years      
Maturing in one year or less 4 months 24 days    
Maturing after one year through five years 2 years 3 months 18 days    
Total 1 year 3 months 18 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%    
Amortized Cost      
Maturing in one year or less $ 11    
Maturing after one year through five years 14,070    
Maturing after five years through ten years 15,629    
Maturing after ten years 757    
Amortized Cost 30,467    
Fair Value      
Maturing in one year or less 11    
Maturing after one year through five years 13,335    
Maturing after five years through ten years 14,476    
Maturing after ten years 565    
Fair Value $ 28,387 19,542  
Weighted- Average Maturity in Years      
Maturing in one year or less 1 month 6 days    
Maturing after one year through five years 3 years 2 months 12 days    
Maturing after five years through ten years 6 years 6 months    
Maturing after ten years 10 years 7 months 6 days    
Total 5 years 1 month 6 days    
Weighted- Average Yield      
Maturing in one year or less 4.64%    
Maturing after one year through five years 2.63%    
Maturing after five years through ten years 3.35%    
Maturing after ten years 1.92%    
Total 2.98%    
Maturing in one year or less 4 months 24 days    
Mortgage-backed securities      
Amortized Cost      
Maturing in one year or less $ 42    
Maturing after one year through five years 2,110    
Maturing after five years through ten years 73,667    
Maturing after ten years 1,275    
Amortized Cost 77,094    
Fair Value      
Maturing in one year or less 41    
Maturing after one year through five years 2,091    
Maturing after five years through ten years 61,626    
Maturing after ten years 995    
Fair Value $ 64,753    
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 9 years    
Maturing after ten years 10 years 1 month 6 days    
Total 8 years 9 months 18 days    
Weighted- Average Yield      
Maturing in one year or less 4.52%    
Maturing after one year through five years 4.49%    
Maturing after five years through ten years 2.12%    
Maturing after ten years 2.18%    
Total 2.19%    
Amortized Cost      
Maturing in one year or less $ 30    
Maturing after one year through five years 6,028    
Maturing after five years through ten years 37,699    
Maturing after ten years 481    
Amortized Cost 44,238    
Fair Value      
Maturing in one year or less 29    
Maturing after one year through five years 5,611    
Maturing after five years through ten years 34,560    
Maturing after ten years 438    
Fair Value $ 40,638    
Weighted- Average Maturity in Years      
Maturing in one year or less 7 months 6 days    
Maturing after one year through five years 3 years 10 months 24 days    
Maturing after five years through ten years 7 years 10 months 24 days    
Maturing after ten years 11 years    
Total 7 years 4 months 24 days    
Weighted- Average Yield      
Maturing in one year or less 2.02%    
Maturing after one year through five years 2.87%    
Maturing after five years through ten years 3.96%    
Maturing after ten years 4.76%    
Total 3.82%    
Maturing in one year or less 9 months 18 days    
Asset-backed securities      
Amortized Cost      
Maturing in one year or less $ 0    
Maturing after one year through five years 3,668    
Maturing after five years through ten years 3,468    
Maturing after ten years 0    
Amortized Cost 7,136    
Fair Value      
Maturing in one year or less 0    
Maturing after one year through five years 3,684    
Maturing after five years through ten years 3,481    
Maturing after ten years 0    
Fair Value $ 7,165 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 9 months 18 days    
Weighted- Average Yield      
Maturing in one year or less 0.00%    
Maturing after one year through five years 4.90%    
Maturing after five years through ten years 6.26%    
Maturing after ten years 0.00%    
Total 5.56%    
Obligations of state and political subdivisions      
Amortized Cost      
Maturing in one year or less $ 128    
Maturing after one year through five years 1,698    
Maturing after five years through ten years 1,563    
Maturing after ten years 7,301    
Amortized Cost 10,690    
Fair Value      
Maturing in one year or less 128    
Maturing after one year through five years 1,687    
Maturing after five years through ten years 1,474    
Maturing after ten years 6,263    
Fair Value $ 9,552 9,989  
Weighted- Average Maturity in Years      
Maturing in one year or less 4 months 24 days    
Maturing after one year through five years 2 years 6 months    
Maturing after five years through ten years 7 years 2 months 12 days    
Maturing after ten years 14 years 10 months 24 days    
Total 11 years 8 months 12 days    
Weighted- Average Yield      
Maturing in one year or less 5.53%    
Maturing after one year through five years 4.67%    
Maturing after five years through ten years 3.69%    
Maturing after ten years 3.47%    
Total 3.72%    
Other      
Amortized Cost      
Maturing in one year or less $ 19    
Maturing after one year through five years 225    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Amortized Cost 244 8  
Fair Value      
Maturing in one year or less 16    
Maturing after one year through five years 231    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Fair Value $ 247 8  
Weighted- Average Maturity in Years      
Maturing in one year or less 2 months 12 days    
Maturing after one year through five years 2 years 4 months 24 days    
Total 2 years 2 months 12 days    
Weighted- Average Yield      
Maturing in one year or less 3.24%    
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 2.73%    
Amortized Cost      
Maturing in one year or less $ 49    
Maturing after one year through five years 200    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Amortized Cost 249    
Fair Value      
Maturing in one year or less 49    
Maturing after one year through five years 201    
Maturing after five years through ten years 0    
Maturing after ten years 0    
Fair Value $ 250 $ 24  
Weighted- Average Maturity in Years      
Maturing in one year or less 8 months 12 days    
Maturing after one year through five years 1 year 8 months 12 days    
Total 1 year 6 months    
Weighted- Average Yield      
Maturing in one year or less 4.66%    
Maturing after one year through five years 4.82%    
Maturing after five years through ten years 0.00%    
Maturing after ten years 0.00%    
Total 4.79%    
Maturing in one year or less 2 months 12 days    
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.