Variable Interest Entities - Carrying Amount of Consolidated VIEs (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 498	$ 541	$ 2,272
Net finance receivables	19,986	19,212
Allowance for finance receivable losses	2,311	2,095	2,269	$ 829
Restricted cash and restricted cash equivalents	461	476	$ 451
Other assets	1,150	1,003
Long-term debt	18,281	17,750
Consolidated VIEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	2	2
Net finance receivables	10,432	8,821
Allowance for finance receivable losses	1,126	910
Restricted cash and restricted cash equivalents	442	466
Other assets	28	26
Long-term debt	9,361	7,999
Other liabilities	$ 20	$ 13