Deposits - Time Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Time Deposits, $250,000 or More	$ 6,405	$ 14,502
Domestic Deposits
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Time Deposits, $250,000 or More	6,140	14,270
Foreign Deposits
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Time Deposits, $250,000 or More	$ 265	$ 232