Long-Term Debt - Notes Associated with Consolidated VIEs (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Debt Instrument
Long-term debt	[1]	$ 11,821	$ 14,973
Variable Interest Entity, Primary Beneficiary | Automobile Loans
Debt Instrument
Long-term debt		$ 250

[1] Includes $24 and $55 of other short-term investments, $322 and $756 of portfolio loans and leases, $(2) and $(7) of ALLL, $2 and $5 of other assets, $1 and $2 of other liabilities and $263 and $656 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2021 and 2020, respectively. For further information, refer to Note 12.