Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Short Term and Long Term Debt [Line Items]
Secured debt	$ 38,095	$ 39,338
Unsecured debt	55,509	53,223
Total secured and unsecured debt	93,603	92,561
Secured debt fair value	37,584	39,401
Unsecured debt fair value	53,148	54,357
Fair value of Secured and Unsecured debt	90,732	93,758
Level 2
Short Term and Long Term Debt [Line Items]
Fair value of Secured and Unsecured debt	89,003	92,250
Level 3
Short Term and Long Term Debt [Line Items]
Fair value of Secured and Unsecured debt	1,729	1,508
Revolving Credit Facility
Short Term and Long Term Debt [Line Items]
Secured debt	1,288	3,497
Unsecured debt	1,348	1,229
Secured debt fair value	1,288	3,495
Unsecured debt fair value	1,324	1,211
Securitization Notes Payable
Short Term and Long Term Debt [Line Items]
Secured debt	36,806	35,841
Secured debt fair value	36,296	35,906
Senior Notes
Short Term and Long Term Debt [Line Items]
Unsecured debt	47,003	45,386
Unsecured debt fair value	44,672	46,539
Other Unsecured Debt
Short Term and Long Term Debt [Line Items]
Unsecured debt	7,158	6,608
Unsecured debt fair value	$ 7,152	$ 6,607