Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Short Term and Long Term Debt [Line Items]
Secured debt	$ 41,253	$ 42,131
Unsecured debt	56,814	54,723
Total secured and unsecured debt	98,067	96,854
Secured debt fair value	40,773	41,467
Unsecured debt fair value	55,009	52,270
Fair value of Secured and Unsecured debt	95,782	93,738
Level 2
Short Term and Long Term Debt [Line Items]
Fair value of Secured and Unsecured debt	93,799	91,545
Level 3
Short Term and Long Term Debt [Line Items]
Fair value of Secured and Unsecured debt	1,983	2,192
Revolving Credit Facility
Short Term and Long Term Debt [Line Items]
Secured debt	2,839	3,931
Unsecured debt	1,587	1,473
Secured debt fair value	2,839	3,931
Unsecured debt fair value	1,563	1,448
Securitization Notes Payable
Short Term and Long Term Debt [Line Items]
Secured debt	38,414	38,200
Secured debt fair value	37,934	37,537
Senior Notes
Short Term and Long Term Debt [Line Items]
Unsecured debt	47,939	46,111
Unsecured debt fair value	46,158	43,676
Other Unsecured Debt
Short Term and Long Term Debt [Line Items]
Unsecured debt	7,287	7,139
Unsecured debt fair value	$ 7,288	$ 7,146