Fair Value Disclosures - Financial Assets and Liabilities Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Financial assets:
HTM securities	$ 45,956	$ 47,791
Loans and leases HFI, net of ALLL	317,486	321,614
Financial liabilities:
Long-term debt	44,749	43,203
Carrying Amount | Level 2
Financial assets:
HTM securities	55,958	57,713
Financial liabilities:
Time deposits	42,227	23,474
Long-term debt	44,749	43,203
Carrying Amount | Level 3
Financial assets:
Loans and leases HFI, net of ALLL	317,470	321,596
Fair Value | Level 2
Financial assets:
HTM securities	45,956	47,791
Financial liabilities:
Time deposits	41,992	23,383
Long-term debt	43,072	40,951
Fair Value | Level 3
Financial assets:
Loans and leases HFI, net of ALLL	$ 308,846	$ 308,738