Allowance for Credit Losses - Schedule of Allowance for Credit Losses on Unfunded Commitments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	$ 922	$ 178
Day 2 provision for loans and leases	462	454
(Benefit) for credit losses - loans and leases		(53)
Provision for credit losses - loans and leases	71
Total provision for credit losses - unfunded commitments	783	464
Allowance for credit losses, ending balance	1,605	848
Unfunded Commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	106	12
Day 2 provision for loans and leases	254	59
(Benefit) for credit losses - loans and leases	(8)
Provision for credit losses - loans and leases		4
Total provision for credit losses - unfunded commitments	246	63
Allowance for credit losses, ending balance	$ 352	$ 75