Loans and Leases - Schedule of Loans Charge-offs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 199	$ 33	$ 437	$ 107
Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			43
2022			119
2021			63
2020			67
2019			53
2018 & Prior			26
Revolving			65
Revolving Converted to Term Loans			1
Total			437
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	85	28	209	92
Commercial | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			6
2022			60
2021			27
2020			10
2019			53
2018 & Prior			24
Revolving			28
Revolving Converted to Term Loans			1
Total			209
Commercial | Owner occupied commercial mortgage | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			0
2022			0
2021			0
2020			0
2019			0
2018 & Prior			0
Revolving			1
Revolving Converted to Term Loans			0
Total			1
Commercial | Non-owner occupied commercial mortgage | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			0
2022			0
2021			0
2020			0
2019			48
2018 & Prior			12
Revolving			0
Revolving Converted to Term Loans			0
Total			60
Commercial | Commercial and industrial | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			5
2022			53
2021			23
2020			7
2019			4
2018 & Prior			11
Revolving			27
Revolving Converted to Term Loans			1
Total			131
Commercial | Leases | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			1
2022			7
2021			4
2020			3
2019			1
2018 & Prior			1
Revolving			0
Revolving Converted to Term Loans			0
Total			17
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7	5	20	15
Consumer | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			5
2022			2
2021			1
2020			1
2019			0
2018 & Prior			2
Revolving			9
Revolving Converted to Term Loans			0
Total			20
Consumer | Residential mortgage | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			0
2022			0
2021			0
2020			0
2019			0
2018 & Prior			2
Revolving			0
Revolving Converted to Term Loans			0
Total			2
Consumer | Consumer auto | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			0
2022			1
2021			0
2020			1
2019			0
2018 & Prior			0
Revolving			0
Revolving Converted to Term Loans			0
Total			2
Consumer | Consumer other | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			5
2022			1
2021			1
2020			0
2019			0
2018 & Prior			0
Revolving			9
Revolving Converted to Term Loans			0
Total			16
SVB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 107	$ 0	208	$ 0
SVB | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			32
2022			57
2021			35
2020			56
2019			0
2018 & Prior			0
Revolving			28
Revolving Converted to Term Loans			0
Total			208
SVB | Investor dependent - early stage | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			1
2022			17
2021			18
2020			3
2019			0
2018 & Prior			0
Revolving			10
Revolving Converted to Term Loans			0
Total			49
SVB | Investor dependent - growth stage | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			24
2022			40
2021			17
2020			13
2019			0
2018 & Prior			0
Revolving			1
Revolving Converted to Term Loans			0
Total			95
SVB | Innovation C&I and cash flow dependent | Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
2023			7
2022			0
2021			0
2020			40
2019			0
2018 & Prior			0
Revolving			17
Revolving Converted to Term Loans			0
Total			$ 64