Allowance for Credit Losses - Schedule of Allowance for Credit Losses (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
Initial PCD ACL	200	284
Day 2 provision for loans and leases	462	454
Provision for credit losses - loans and leases	71
(Benefit) for credit losses - loans and leases		(53)
Total provision for credit losses- loans and leases	533	401
charege-offs	(62)	(33)
Recoveries	12	18
Allowance for credit losses, ending balance	1,605	848
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	789	80
Initial PCD ACL	0	270
Day 2 provision for loans and leases	0	432
Provision for credit losses - loans and leases	58
(Benefit) for credit losses - loans and leases		(23)
Total provision for credit losses- loans and leases	58	409
charege-offs	(55)	(28)
Recoveries	8	12
Allowance for credit losses, ending balance	800	743
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	133	98
Initial PCD ACL	0	14
Day 2 provision for loans and leases	0	22
Provision for credit losses - loans and leases	13
(Benefit) for credit losses - loans and leases		(30)
Total provision for credit losses- loans and leases	13	(8)
charege-offs	(7)	(5)
Recoveries	4	6
Allowance for credit losses, ending balance	143	105
SVB
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	0	0
Initial PCD ACL	200	0
Day 2 provision for loans and leases	462	0
Provision for credit losses - loans and leases	0
(Benefit) for credit losses - loans and leases		0
Total provision for credit losses- loans and leases	462	0
charege-offs	0	0
Recoveries	0	0
Allowance for credit losses, ending balance	$ 662	$ 0