Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Short Term and Long Term Debt [Line Items]
Secured debt	$ 40,733	$ 39,338
Unsecured debt	53,090	53,223
Total secured and unsecured debt	93,823	92,561
Secured debt fair value	40,056	39,401
Unsecured debt fair value	50,055	54,357
Fair value of Secured and Unsecured debt	90,111	93,758
Level 2
Short Term and Long Term Debt [Line Items]
Fair value of Secured and Unsecured debt	88,350	92,250
Level 3
Short Term and Long Term Debt [Line Items]
Fair value of Secured and Unsecured debt	1,761	1,508
Revolving Credit Facility
Short Term and Long Term Debt [Line Items]
Secured debt	3,805	3,497
Unsecured debt	1,362	1,229
Secured debt fair value	3,804	3,495
Unsecured debt fair value	1,335	1,211
Securitization Notes Payable
Short Term and Long Term Debt [Line Items]
Secured debt	36,929	35,841
Secured debt fair value	36,252	35,906
Senior Notes
Short Term and Long Term Debt [Line Items]
Unsecured debt	44,259	45,386
Unsecured debt fair value	41,251	46,539
Other Unsecured Debt
Short Term and Long Term Debt [Line Items]
Unsecured debt	7,469	6,608
Unsecured debt fair value	$ 7,470	$ 6,607