Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Short Term and Long Term Debt [Line Items]
Secured debt	$ 42,004	$ 42,131
Unsecured debt	59,614	54,723
Total secured and unsecured debt	101,618	96,854
Secured debt fair value	41,427	41,467
Unsecured debt fair value	57,622	52,270
Fair value of Secured and Unsecured debt	99,049	93,738
Level 2
Short Term and Long Term Debt [Line Items]
Fair value of Secured and Unsecured debt	97,015	91,545
Level 3
Short Term and Long Term Debt [Line Items]
Fair value of Secured and Unsecured debt	2,035	2,192
Revolving credit facilities
Short Term and Long Term Debt [Line Items]
Secured debt	1,251	3,931
Unsecured debt	1,831	1,473
Secured debt fair value	1,251	3,931
Unsecured debt fair value	1,812	1,448
Securitization notes payable
Short Term and Long Term Debt [Line Items]
Secured debt	40,753	38,200
Secured debt fair value	40,177	37,537
Senior notes
Short Term and Long Term Debt [Line Items]
Unsecured debt	50,125	46,111
Unsecured debt fair value	48,136	43,676
Other unsecured debt
Short Term and Long Term Debt [Line Items]
Unsecured debt	7,659	7,139
Unsecured debt fair value	$ 7,673	$ 7,146