Variable Interest Entities - Carrying Amount of Consolidated VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 541	$ 2,272	$ 1,227
Net finance receivables	19,212	18,084
Allowance for finance receivable losses	2,095	2,269	829	$ 731
Restricted cash and restricted cash equivalents	476	451	$ 405
Other assets	1,003	1,054
Long-term debt	17,750	17,800
Consolidated VIEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	2	2
Net finance receivables	8,821	8,772
Allowance for finance receivable losses	910	1,085
Restricted cash and restricted cash equivalents	466	441
Other assets	26	33
Long-term debt	7,999	7,789
Other liabilities	$ 13	$ 15