Fair Value of Assets and Liabilities - Schedule Of Unobservable Inputs Utilized In Determining The Fair Value Of Level 3 Recurring And Non-Recurring Measurements (Details) $ in Millions	Jun. 30, 2023 USD ($) month	Dec. 31, 2022 USD ($) month
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale at fair value	$ 8,600	$ 8,836
Loans held-for-sale	95	51
Derivative Liabilities, fair value	899	929
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities, fair value	34	27
Loans and leases, fair value	243	135
OREO, fair value	4	3
Level 3 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	46	43
Level 3 | Residential Real Estate | Loans Held For Sale, Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale	22	22
Level 3 | Interest-only strips | Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale at fair value	$ 36	$ 25
Constant prepayment rate | Level 3 | Interest-only strips | Minimum | Discounted cash flow | Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.12	0.12
Constant prepayment rate | Level 3 | Interest-only strips | Maximum | Discounted cash flow | Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.13	0.13
Constant prepayment rate | Level 3 | Interest-only strips | Weighted Average | Discounted cash flow | Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.12	0.12
Bond equivalent yield | Level 3 | Interest-only strips | Minimum | Discounted cash flow | Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.18	0.17
Bond equivalent yield | Level 3 | Interest-only strips | Maximum | Discounted cash flow | Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.20
Bond equivalent yield | Level 3 | Interest-only strips | Weighted Average | Discounted cash flow | Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities, available-for-sale, measurement input	0.18	0.17
Prepayment speeds - First mortgage | Level 3 | Loans held for sale—first mortgages | Minimum | Discounted cash flow | Loans Held For Sale, Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.02	2
Prepayment speeds - First mortgage | Level 3 | Loans held for sale—first mortgages | Maximum | Discounted cash flow | Loans Held For Sale, Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.07	8
Prepayment speeds - First mortgage | Level 3 | Loans held for sale—first mortgages | Weighted Average | Discounted cash flow | Loans Held For Sale, Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.03	0.03
Foreclosure losses | Level 3 | Residential Real Estate | Minimum | Discounted cash flow | Loans Held For Sale, Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.64	63
Foreclosure losses | Level 3 | Residential Real Estate | Maximum | Discounted cash flow | Loans Held For Sale, Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.76	75
Foreclosure losses | Level 3 | Residential Real Estate | Weighted Average | Discounted cash flow | Loans Held For Sale, Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.65	0.65
Loss severity trends - First mortgage | Level 3 | Loans held for sale—first mortgages | Minimum | Discounted cash flow | Loans Held For Sale, Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0	0
Loss severity trends - First mortgage | Level 3 | Loans held for sale—first mortgages | Maximum | Discounted cash flow | Loans Held For Sale, Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.11	11
Loss severity trends - First mortgage | Level 3 | Loans held for sale—first mortgages | Weighted Average | Discounted cash flow | Loans Held For Sale, Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input	0.05	0.05
Visa covered litigation resolution amount | Level 3 | Minimum | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, measurement input, value	$ 6,200	$ 5,600
Visa covered litigation resolution amount | Level 3 | Maximum | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, measurement input, value	7,200	6,000
Visa covered litigation resolution amount | Level 3 | Weighted Average | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, measurement input, value	$ 6,800	$ 5,900
Probability of resolution scenarios | Level 3 | Minimum | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, measurement input	0.10	5
Probability of resolution scenarios | Level 3 | Maximum | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, measurement input	0.25	25
Probability of resolution scenarios | Level 3 | Weighted Average | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, measurement input	0.18	0.20
Time until resolution | Level 3 | Minimum | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, measurement input | month	12	12
Time until resolution | Level 3 | Maximum | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, measurement input | month	42	42
Time until resolution | Level 3 | Weighted Average | Discounted cash flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities, measurement input | month	29	28
Marketability adjustments for specific properties | Level 3 | Minimum | Appraisals from comparable properties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases, measurement input	0	0
Marketability adjustments for specific properties | Level 3 | Minimum | Appraisals from comparable properties | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, measurement input	0	0
Marketability adjustments for specific properties | Level 3 | Maximum | Appraisals from comparable properties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases, measurement input	0.10	10
Marketability adjustments for specific properties | Level 3 | Maximum | Appraisals from comparable properties | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, measurement input	0.25	25
Borrowing base certificates adjustment | Level 3 | Minimum | Other collateral valuations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases, measurement input	0.20	20
Borrowing base certificates adjustment | Level 3 | Maximum | Other collateral valuations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases, measurement input	0.50	50
Financial Statements/Auction values adjustment | Level 3 | Minimum | Other collateral valuations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases, measurement input	0	0
Financial Statements/Auction values adjustment | Level 3 | Maximum | Other collateral valuations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases, measurement input	0.25	25
Adjustment for value changes since appraisal | Level 3 | Minimum | Appraisals from comparable properties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO measurement input	0	0
Adjustment for value changes since appraisal | Level 3 | Maximum | Appraisals from comparable properties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO measurement input	0.10	10
Adjustments to current sales yields for specific properties | Level 3 | Minimum | Discounted cash flow | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, measurement input	0	0
Adjustments to current sales yields for specific properties | Level 3 | Maximum | Discounted cash flow | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets, measurement input	0.15	15