Commitments and Contingencies - Schedule of Fair Value, Off-balance Sheet Risks (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financing assets (excluding leases)
Other Commitments [Line Items]
Credit related commitments	$ 62,689	$ 23,452
Standby letters of credit
Other Commitments [Line Items]
Credit related commitments	2,721	436
Other letters of credit
Other Commitments [Line Items]
Credit related commitments	114	44
Deferred Purchase Agreements
Other Commitments [Line Items]
Credit related commitments	2,087	2,039
Lessor commitments
Other Commitments [Line Items]
Credit related commitments	$ 1,014	$ 941