v3.26.1
Investment Securities - Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Amount      
Total available-for-sale securities $ 23,038   $ 22,973
Due in one year or less 480   465
Due after one year through five years 4,737   4,228
Due after five years through ten years 3,616   3,581
Due after ten years $ 14,205   $ 14,699
Yield      
Total 3.00%   3.00%
Due in one year or less 2.80%   2.50%
Due after one year through five years 3.30%   3.40%
Due after five years through ten years 3.00%   2.90%
Due after ten years 2.90%   2.90%
Amortized cost basis of available-for-sale securities      
Amortized cost basis $ 25,974   $ 25,825
Due in one year or less 483   468
Due after one year through five years 4,871   4,298
Due after five years through ten years 4,046   3,968
Due after ten years 16,574   17,091
Amount      
Amortized cost basis 4,337   4,371
Due in one year or less 0   0
Due after one year through five years 34   40
Due after five years through ten years 14   16
Due after ten years $ 4,289   $ 4,315
Yield      
Total 3.00%   3.00%
Due in one year or less 0.00%   0.00%
Due after one year through five years 5.00%   5.00%
Due after five years through ten years 5.70%   5.70%
Due after ten years 3.00%   3.00%
Cash equivalents $ 444   $ 107
Taxable interest 214 $ 210  
Taxable dividends 4 5  
Interest and dividends exempt from U.S. federal income tax 5 6  
Interest and dividends on investment securities and other earning assets 223 $ 221  
U.S. Treasury and federal agencies      
Amount      
Total available-for-sale securities 2,397   2,279
Due in one year or less 68   84
Due after one year through five years 2,050   1,771
Due after five years through ten years 279   424
Due after ten years $ 0   $ 0
Yield      
Total 3.50%   3.40%
Due in one year or less 1.50%   0.80%
Due after one year through five years 3.70%   3.90%
Due after five years through ten years 2.30%   2.00%
Due after ten years 0.00%   0.00%
Amortized cost basis of available-for-sale securities      
Amortized cost basis $ 2,444   $ 2,308
U.S. States and political subdivisions      
Amount      
Total available-for-sale securities 517   551
Due in one year or less 39   48
Due after one year through five years 54   50
Due after five years through ten years 53   65
Due after ten years $ 371   $ 388
Yield      
Total 3.40%   3.40%
Due in one year or less 5.10%   4.80%
Due after one year through five years 3.70%   3.70%
Due after five years through ten years 4.50%   4.30%
Due after ten years 3.10%   3.10%
Amortized cost basis of available-for-sale securities      
Amortized cost basis $ 593   $ 624
Foreign government      
Amount      
Total available-for-sale securities 199   188
Due in one year or less 14   14
Due after one year through five years 92   75
Due after five years through ten years 93   99
Due after ten years $ 0   $ 0
Yield      
Total 2.80%   2.80%
Due in one year or less 1.90%   2.00%
Due after one year through five years 2.30%   2.30%
Due after five years through ten years 3.40%   3.30%
Due after ten years 0.00%   0.00%
Amortized cost basis of available-for-sale securities      
Amortized cost basis $ 202   $ 191
Agency mortgage-backed residential      
Amount      
Total available-for-sale securities 12,695   12,901
Due in one year or less 0   0
Due after one year through five years 1   1
Due after five years through ten years 0   0
Due after ten years $ 12,694   $ 12,900
Yield      
Total 2.90%   2.90%
Due in one year or less 0.00%   0.00%
Due after one year through five years 2.80%   2.80%
Due after five years through ten years 0.00%   0.00%
Due after ten years 2.90%   2.90%
Amortized cost basis of available-for-sale securities      
Amortized cost basis $ 14,787   $ 14,966
Amount      
Amortized cost basis 1,337   1,303
Due in one year or less 0   0
Due after one year through five years 0   0
Due after five years through ten years 0   0
Due after ten years $ 1,337   $ 1,303
Yield      
Total 3.50%   3.50%
Due in one year or less 0.00%   0.00%
Due after one year through five years 0.00%   0.00%
Due after five years through ten years 0.00%   0.00%
Due after ten years 3.50%   3.50%
Hedged liability, fair value hedge, cumulative increase (decrease) $ 31    
Hedged asset, fair value hedge, cumulative increase (decrease)     $ 13
Mortgage-backed residential      
Amount      
Total available-for-sale securities 193   198
Due in one year or less 0   0
Due after one year through five years 0   0
Due after five years through ten years 0   0
Due after ten years $ 193   $ 198
Yield      
Total 2.70%   2.70%
Due in one year or less 0.00%   0.00%
Due after one year through five years 0.00%   0.00%
Due after five years through ten years 0.00%   0.00%
Due after ten years 2.70%   2.70%
Amortized cost basis of available-for-sale securities      
Amortized cost basis $ 226   $ 230
Amount      
Amortized cost basis 2,957   3,018
Due in one year or less 0   0
Due after one year through five years 4   5
Due after five years through ten years 1   1
Due after ten years $ 2,952   $ 3,012
Yield      
Total 2.80%   2.80%
Due in one year or less 0.00%   0.00%
Due after one year through five years 2.90%   2.90%
Due after five years through ten years 5.30%   5.50%
Due after ten years 2.80%   2.80%
Agency mortgage-backed commercial      
Amount      
Total available-for-sale securities $ 5,107   $ 4,932
Due in one year or less 144   87
Due after one year through five years 1,647   1,453
Due after five years through ten years 2,491   2,314
Due after ten years $ 825   $ 1,078
Yield      
Total 2.70%   2.70%
Due in one year or less 3.10%   3.40%
Due after one year through five years 3.30%   3.50%
Due after five years through ten years 2.40%   2.40%
Due after ten years 2.30%   2.30%
Amortized cost basis of available-for-sale securities      
Amortized cost basis $ 5,729   $ 5,540
Yield      
Hedged asset, fair value hedge, cumulative increase (decrease) 10   33
Asset-backed      
Amount      
Total available-for-sale securities 2   12
Due in one year or less 1   0
Due after one year through five years 1   12
Due after five years through ten years 0   0
Due after ten years $ 0   $ 0
Yield      
Total 1.50%   1.50%
Due in one year or less 1.50%   0.00%
Due after one year through five years 1.30%   1.50%
Due after five years through ten years 0.00%   0.00%
Due after ten years 0.00%   0.00%
Amortized cost basis of available-for-sale securities      
Amortized cost basis $ 2   $ 12
Amount      
Amortized cost basis 43   50
Due in one year or less 0   0
Due after one year through five years 30   35
Due after five years through ten years 13   15
Due after ten years $ 0   $ 0
Yield      
Total 5.40%   5.40%
Due in one year or less 0.00%   0.00%
Due after one year through five years 5.30%   5.30%
Due after five years through ten years 5.70%   5.70%
Due after ten years 0.00%   0.00%
Corporate debt      
Amount      
Total available-for-sale securities $ 1,928   $ 1,912
Due in one year or less 214   232
Due after one year through five years 892   866
Due after five years through ten years 700   679
Due after ten years $ 122   $ 135
Yield      
Total 3.60%   3.40%
Due in one year or less 2.60%   2.40%
Due after one year through five years 2.50%   2.50%
Due after five years through ten years 4.90%   4.60%
Due after ten years 5.40%   5.50%
Amortized cost basis of available-for-sale securities      
Amortized cost basis $ 1,991   $ 1,954