Finance Receivables - Credit Risk Profile by FICO Score (Details) - Retail Finance Receivables - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
2022	$ 7,804	$ 27,638
2021	25,081	17,324
2020	15,531	7,084
2019	6,192	3,918
2018	3,296	1,607
Prior	1,599	522
Total	$ 59,503	$ 58,093	$ 53,397
Percent of portfolio	100.00%	100.00%
Prime - FICO Score 680 and greater
Financing Receivable, Credit Quality Indicator [Line Items]
2022	$ 6,019	$ 19,729
2021	17,792	12,408
2020	11,121	4,078
2019	3,540	2,298
2018	1,912	763
Prior	655	143
Total	$ 41,039	$ 39,419
Percent of portfolio	69.00%	67.90%
Near-prime - FICO Score 620 to 679
Financing Receivable, Credit Quality Indicator [Line Items]
2022	$ 856	$ 3,856
2021	3,569	2,388
2020	2,153	1,229
2019	1,089	648
2018	553	274
Prior	274	84
Total	$ 8,494	$ 8,479
Percent of portfolio	14.30%	14.60%
Sub-prime - FICO Score less than 620
Financing Receivable, Credit Quality Indicator [Line Items]
2022	$ 929	$ 4,053
2021	3,720	2,528
2020	2,258	1,777
2019	1,563	972
2018	831	570
Prior	669	295
Total	$ 9,970	$ 10,195
Percent of portfolio	16.80%	17.50%