Allowance for Credit Losses - Schedule of Allowance for Credit Losses (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jan. 02, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	$ 178	$ 850	$ 189	$ 178		$ 225
Initial PCD ACL		0
Initial PCD ACL					$ 272
Initial Non-PCD Provision		0			454
Provision for credit losses - loans and leases		50		(33)
(Benefit) for credit losses - loans and leases			(1)			(32)
Total provision for credit losses- loans and leases		50		487
charege-offs		(33)	(11)	(107)		(27)
Recoveries		15	6	52		17
Allowance for credit losses, ending balance		882	183	882	882	183
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	740	86	80		92
Initial PCD ACL		0
Initial PCD ACL					258
Initial Non-PCD Provision		0			432
Provision for credit losses - loans and leases		43	0	53
(Benefit) for credit losses - loans and leases						(3)
Total provision for credit losses- loans and leases		43		485
charege-offs		(28)	(7)	(92)		(14)
Recoveries		11	3	35		7
Allowance for credit losses, ending balance		766	82	766	766	82
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning balance	$ 98	110	103	98		133
Initial PCD ACL		0
Initial PCD ACL					14
Initial Non-PCD Provision		0			22
Provision for credit losses - loans and leases		7
(Benefit) for credit losses - loans and leases			(1)	(20)		(29)
Total provision for credit losses- loans and leases		7		2
charege-offs		(5)	(4)	(15)		(13)
Recoveries		4	3	17		10
Allowance for credit losses, ending balance		$ 116	$ 101	$ 116	$ 116	$ 101