Allowance for Credit Losses - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 02, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	$ 178	$ 848	$ 210	$ 178		$ 225
Initial PCD ACL		(12)
Initial PCD ACL					$ 272
Initial Non-PCD Provision		0			454
Provision for credit losses - loans and leases		36
(Benefit) for credit losses - loans and leases			(19)	(17)		(31)
Total provision (benefit) for credit losses- loans and leases		36		437
charege-offs		(41)	(7)	(74)		(16)
Recoveries		19	5	37		11
Allowance for credit losses, ending balance		850	189	850	850	189
Allowance for credit loss prior to acquisition date	243
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	80	743	86	80		92
Initial PCD ACL		(12)
Initial PCD ACL					258
Initial Non-PCD Provision		0			432
Provision for credit losses - loans and leases		33	(1)	10
(Benefit) for credit losses - loans and leases						(3)
Total provision (benefit) for credit losses- loans and leases		33		442
charege-offs		(36)	(3)	(64)		(7)
Recoveries		12	2	24		4
Allowance for credit losses, ending balance		740	86	740	740	86
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	$ 98	105	124	98		133
Initial PCD ACL		0
Initial PCD ACL					14
Initial Non-PCD Provision		0			22
Provision for credit losses - loans and leases		3
(Benefit) for credit losses - loans and leases			(20)	(27)		(28)
Total provision (benefit) for credit losses- loans and leases		3		(5)
charege-offs		(5)	(4)	(10)		(9)
Recoveries		7	3	13		7
Allowance for credit losses, ending balance		$ 110	$ 103	$ 110	$ 110	$ 103