Fair Value Disclosures - Financial Assets and Liabilities Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Financial assets:
HTM securities	$ 39,611	$ 40,286
Loans and leases, net of ALLL	313,897	301,526
Financial liabilities:
Long-term debt	44,427	34,956
Carrying Amount | Level 2
Financial assets:
HTM securities	48,973	50,640
Financial liabilities:
Time deposits	47,271	36,532
Long-term debt	44,427	34,956
Carrying Amount | Level 3
Financial assets:
Loans and leases, net of ALLL	313,885	301,513
Fair Value | Level 2
Financial assets:
HTM securities	39,611	40,286
Financial liabilities:
Time deposits	47,147	36,377
Long-term debt	44,610	34,917
Fair Value | Level 3
Financial assets:
Loans and leases, net of ALLL	$ 309,836	$ 294,190