Allowance for Credit Losses - Schedule of Allowance for Credit Losses on Unfunded Commitments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	$ 1,605	$ 848	$ 922	$ 178
Day 2 provision for loans and leases	0	0	462	454
(Benefit) for credit losses - loans and leases				(17)
Provision for credit losses - loans and leases	169	36	240
Total (benefit) provision for credit losses - unfunded commitments	151	42	934	506
Allowance for credit losses, ending balance	1,637	850	1,637	850
Unfunded Commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	352	75	106	12
Day 2 provision for loans and leases	0	0	254	59
(Benefit) for credit losses - loans and leases	(17)		(25)
Provision for credit losses - loans and leases		6		10
Total (benefit) provision for credit losses - unfunded commitments	(17)	6	229	69
Allowance for credit losses, ending balance	$ 335	$ 81	$ 335	$ 81