Regulatory Capital and Other Regulatory Matters (Details) $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Capital Requirements on Foreign Financial Institutions [Line Items]
Assets	$ 113,825	$ 109,217
Brazil [Member]
Capital Requirements on Foreign Financial Institutions [Line Items]
Capital ratio	0.343
International Regulated Bank And Finance Companies [Member]
Capital Requirements on Foreign Financial Institutions [Line Items]
Assets	$ 6,200	$ 7,800
Minimum [Member] | Brazil [Member]
Capital Requirements on Foreign Financial Institutions [Line Items]
Capital requirement	0.093