Fair Value Disclosures - Financial Assets and Liabilities Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financial assets:
HTM securities	$ 48,975	$ 1,495
Loans and leases HFI, net of ALLL	310,130	285,078
Financial liabilities:
Long-term debt	31,172	35,913
Carrying Amount | Level 2
Financial assets:
HTM securities	58,754	1,494
Financial liabilities:
Time deposits	14,454	15,886
Long-term debt	31,172	35,913
Carrying Amount | Level 3
Financial assets:
Loans and leases HFI, net of ALLL	310,111	285,055
Fair Value | Level 2
Financial assets:
HTM securities	48,975	1,495
Financial liabilities:
Time deposits	14,521	16,017
Long-term debt	29,568	36,251
Fair Value | Level 3
Financial assets:
Loans and leases HFI, net of ALLL	$ 301,437	$ 284,914