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, 2022 USD ($) month	Dec. 31, 2021 USD ($) month
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale at fair value	$ 8,941	$ 8,707
Loans held-for-sale	143	258
Derivative Liabilities, fair value	578	103
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liabilities, fair value	28	23
Loans and leases, fair value	133	84
OREO, fair value	2	3
Level 3 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets	40	30
Level 3 | SBAs | Loans Held For Sale - SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale		1
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	35	29
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	$ 26	$ 38
Constant prepayment rate | Level 3 | SBAs | Minimum | Discounted cash flow | Loans Held For Sale - SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		8
Constant prepayment rate | Level 3 | SBAs | Maximum | Discounted cash flow | Loans Held For Sale - SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		12
Constant prepayment rate | Level 3 | SBAs | Weighted Average | Discounted cash flow | Loans Held For Sale - SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		0.10
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	0.11
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		0.12
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	0.11
Bond equivalent yield | Level 3 | SBAs | Minimum | Discounted cash flow | Loans Held For Sale - SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		11
Bond equivalent yield | Level 3 | SBAs | Weighted Average | Discounted cash flow | Loans Held For Sale - SBA
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held-for-sale, measurement input		0.11
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	0.16	0.11
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	0.18	0.14
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	0.16	0.11
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	0.03	4
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	0.10	12
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	0.04	0.05
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	0.63	54
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	0.77	66
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	1
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	0.12	14
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	0.07	0.08
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	$ 5,400	$ 5,800
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	6,200	6,200
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	$ 5,900	$ 6,000
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	15
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	0.30	35
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	0.24	0.24
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	6	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	36	36
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	24	25
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