Loans, Leases, and Allowance for Credit Losses (Collateral-Dependent Loans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized Cost	$ 7	$ 47
Recorded investment resulting from the following modification types	235	326
Interest rate below market
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	8	36
Nonaccruing
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	38	105
Nonaccruing | Interest rate below market
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	4	6
Commercial | Nonaccruing
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	23	84
Commercial | Nonaccruing | Interest rate below market
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	4	6
Commercial real estate | Nonaccruing
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	10	16
Commercial real estate | Nonaccruing | Interest rate below market
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	0	0
Consumer | Nonaccruing
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	5	5
Consumer | Nonaccruing | Interest rate below market
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	0	0
Commercial and industrial | Commercial | Nonaccruing
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	15	64
Commercial and industrial | Commercial | Nonaccruing | Interest rate below market
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	0	1
Commercial and industrial | Commercial | Corporate assets, Single family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized Cost		$ 27
Weighted Average LTV		55.00%
Owner-occupied | Commercial | Nonaccruing
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	8	$ 20
Owner-occupied | Commercial | Nonaccruing | Interest rate below market
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	4	5
Owner-occupied | Commercial | Land, Warehouse, Office Building
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized Cost	$ 2	$ 11
Weighted Average LTV	29.00%	40.00%
Term | Commercial real estate | Nonaccruing
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	$ 10	$ 16
Term | Commercial real estate | Nonaccruing | Interest rate below market
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	0	0
Term | Commercial real estate | Multi-family, Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized Cost	$ 1	$ 2
Weighted Average LTV	55.00%	28.00%
Home equity credit line | Consumer | Nonaccruing
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	$ 1	$ 1
Home equity credit line | Consumer | Nonaccruing | Interest rate below market
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	0	0
Home equity credit line | Consumer | Single family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized Cost	$ 1	$ 5
Weighted Average LTV	13.00%	45.00%
1-4 family residential | Consumer | Nonaccruing
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	$ 4	$ 4
1-4 family residential | Consumer | Nonaccruing | Interest rate below market
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment resulting from the following modification types	0	0
1-4 family residential | Consumer | Single family residential
Financing Receivable, Allowance for Credit Losses [Line Items]
Amortized Cost	$ 3	$ 2
Weighted Average LTV	41.00%	35.00%