Loans with Government Guarantees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Abstract]
Debt instrument, term	10 years
Loans with government guarantees	$ 2,516	$ 736
Repurchase option	1,900
Increase in repurchase option	1,800
Repossessed assets and associated claims	$ 17	$ 45