Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Short Term and Long Term Debt [Line Items]
Secured debt, carrying amount	$ 44,630	$ 45,243
Unsecured debt, carrying amount	65,476	60,084
Total secured and unsecured debt, carrying amount	110,106	105,327
Secured debt fair value	44,560	44,971
Unsecured debt fair value	65,271	59,651
Fair value of Secured and Unsecured debt	109,831	104,622
Level 2
Short Term and Long Term Debt [Line Items]
Fair value of Secured and Unsecured debt	107,820	102,262
Level 3
Short Term and Long Term Debt [Line Items]
Fair value of Secured and Unsecured debt	2,010	2,360
Revolving credit facilities
Short Term and Long Term Debt [Line Items]
Secured debt, carrying amount	1,693	4,960
Unsecured debt, carrying amount	1,893	2,034
Secured debt fair value	1,693	4,960
Unsecured debt fair value	1,883	2,026
Securitization notes payable
Short Term and Long Term Debt [Line Items]
Secured debt, carrying amount	42,938	40,284
Secured debt fair value	42,868	40,012
Senior notes
Short Term and Long Term Debt [Line Items]
Unsecured debt, carrying amount	54,715	49,990
Unsecured debt fair value	54,473	49,537
Other unsecured debt
Short Term and Long Term Debt [Line Items]
Unsecured debt, carrying amount	8,868	8,060
Unsecured debt fair value	$ 8,915	$ 8,088