Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Real Estate Secured Loans (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	$ 66,276	$ 45,181
Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	11,456	4,940
Private Bank
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	8,743	4,901
Private Bank | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	7,659	4,059
Private Bank | Loans for personal residence | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	6,939	3,392
Private Bank | Loans to eligible employees | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	455	481
Private Bank | Home equity lines of credit | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	130	43
Private Bank | Other | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	135	143
CRE
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	2,670	0
CRE | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	2,670	0
CRE | Multifamily and residential investment | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	1,021	0
CRE | Retail | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	524	0
CRE | Office and medical | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	499	0
CRE | Manufacturing, industrial and warehouse | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	336	0
CRE | Hospitality | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	142	0
CRE | Other | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	148	0
Premium wine | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	793	824
Other | Real estate secured loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans, amortized cost	$ 334	$ 57