Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Nonaccrual Loans with No Allowance for Credit Loss (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	$ 76	$ 84
Nonaccrual Loans with no Allowance for Credit Loss	7	9
Investor dependent
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	47	17
Nonaccrual Loans with no Allowance for Credit Loss	1	0
Investor dependent | Early stage
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	4	11
Nonaccrual Loans with no Allowance for Credit Loss	0	0
Investor dependent | Growth stage
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	43	6
Nonaccrual Loans with no Allowance for Credit Loss	1	0
Cash flow dependent and innovation C&I (Commercial and Industrial) | Cash flow dependent - SLBO
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	7	34
Nonaccrual Loans with no Allowance for Credit Loss	0	0
Cash flow dependent and innovation C&I (Commercial and Industrial) | Innovation C&I
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	1	1
Nonaccrual Loans with no Allowance for Credit Loss	0	1
Private bank
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	13	21
Nonaccrual Loans with no Allowance for Credit Loss	6	8
CRE
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	5	5
Nonaccrual Loans with no Allowance for Credit Loss	0	0
Other C&I
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	3	4
Nonaccrual Loans with no Allowance for Credit Loss	0	0
PPP Loans
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual Loans	0	2
Nonaccrual Loans with no Allowance for Credit Loss	$ 0	$ 0