Fair Value (Fair Value Measurements- Recurring Quantitative Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Financial Derivatives [Member] | Visa Class B Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Liabilities - Fair Value	$ 104	$ 135
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	8,606	9,788
Recurring Liabilities - Fair Value	495	716
Total Recurring Assets Net of Recurring Liabilities - Fair Value	8,111	9,072
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 4,008	$ 4,798
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	1.00%	1.00%
Constant default rate (CDR)	0.00%	0.00%
Loss Severity	10.00%	6.10%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	24.20%	28.90%
Constant default rate (CDR)	16.70%	16.70%
Loss Severity	98.50%	100.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	7.00%	6.80%
Constant default rate (CDR)	5.40%	5.60%
Loss Severity	53.30%	53.10%
Spread over the benchmark curve	2.41%	2.49%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Third Party Pricing Services Available [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 3,379	$ 4,081
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Third Party Pricing Services Unavailable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	629	717
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 482	$ 563
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	1.00%	1.00%
Constant default rate (CDR)	1.70%	1.70%
Loss Severity	24.20%	14.60%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	14.00%	15.70%
Constant default rate (CDR)	13.90%	13.90%
Loss Severity	100.00%	100.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	6.30%	5.90%
Constant default rate (CDR)	6.80%	7.60%
Loss Severity	77.50%	73.50%
Spread over the benchmark curve	3.24%	3.52%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Third Party Pricing Services Available [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 448	$ 532
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Third Party Pricing Services Unavailable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	34	31
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | State and Municipal [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value		$ 132
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | State and Municipal [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread over the benchmark curve		0.55%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | State and Municipal [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread over the benchmark curve		1.65%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | State and Municipal [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread over the benchmark curve		0.67%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | State and Municipal [Member] | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value		$ 2
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | State and Municipal [Member] | Consensus Pricing [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount		0.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | State and Municipal [Member] | Consensus Pricing [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount		20.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | State and Municipal [Member] | Consensus Pricing [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount		14.90%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Other Debt Securities [Member] | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value		$ 30
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Other Debt Securities [Member] | Consensus Pricing [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount		7.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Other Debt Securities [Member] | Consensus Pricing [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount		95.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Other Debt Securities [Member] | Consensus Pricing [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount		88.60%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Trading Securities - Debt [Member] | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value		$ 32
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Trading Securities - Debt [Member] | Consensus Pricing [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount		0.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Trading Securities - Debt [Member] | Consensus Pricing [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount		15.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Trading Securities - Debt [Member] | Consensus Pricing [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount		8.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 1,063	$ 845
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	0.30%	3.80%
Spread over the benchmark curve	5.59%	8.89%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	46.50%	32.70%
Spread over the benchmark curve	18.83%	18.88%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	10.60%	11.20%
Spread over the benchmark curve	8.93%	10.36%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 526	$ 506
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	3.90%	7.00%
Discount rate	2.60%	2.50%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	26.50%	16.80%
Discount rate	7.70%	8.60%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgage [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Constant prepayment rate (CPR)	5.70%	8.00%
Discount rate	7.50%	6.60%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans Held For Sale [Member] | Commercial Mortgage [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 641	$ 893
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans Held For Sale [Member] | Commercial Mortgage [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread over the benchmark curve	0.85%	0.37%
Estimated servicing cash flows	0.00%	0.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans Held For Sale [Member] | Commercial Mortgage [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread over the benchmark curve	42.70%	40.25%
Estimated servicing cash flows	7.00%	2.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans Held For Sale [Member] | Commercial Mortgage [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread over the benchmark curve	5.47%	5.49%
Estimated servicing cash flows	0.90%	1.20%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Investments [Member] | Direct equity investments [Member] | Multiple Of Adjusted Earnings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 1,098	$ 1,152
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Investments [Member] | Direct equity investments [Member] | Multiple Of Adjusted Earnings [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Multiple of earnings	4.2	3.2
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Investments [Member] | Direct equity investments [Member] | Multiple Of Adjusted Earnings [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Multiple of earnings	14.1	13.9
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Investments [Member] | Direct equity investments [Member] | Multiple Of Adjusted Earnings [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Multiple of earnings	7.6	7.7
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 116	$ 154
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss Severity	8.00%	8.00%
Discount rate	3.90%	3.40%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 123	$ 114
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss Severity	0.00%	0.00%
Cumulative default rate	2.00%	2.00%
Discount rate	4.90%	5.40%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss Severity	100.00%	100.00%
Cumulative default rate	100.00%	100.00%
Discount rate	7.00%	7.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss Severity	27.30%	35.60%
Cumulative default rate	85.10%	90.50%
Discount rate	5.20%	6.40%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 101	$ 129
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount	26.00%	26.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount	99.00%	99.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit and Liquidity discount	54.00%	51.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Assets [Member] | BlackRock Series C Preferred Stock | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 357	$ 375
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Assets [Member] | BlackRock Series C Preferred Stock | Consensus Pricing [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidity Discount	20.00%	20.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Assets [Member] | BlackRock Series C Preferred Stock | Consensus Pricing [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidity Discount	20.00%	20.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Assets [Member] | BlackRock Series C Preferred Stock | Consensus Pricing [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidity Discount	20.00%	20.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives [Member] | BlackRock LTIP [Member] | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Liabilities - Fair Value	$ 357	$ 375
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives [Member] | BlackRock LTIP [Member] | Consensus Pricing [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidity Discount	20.00%	20.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives [Member] | BlackRock LTIP [Member] | Consensus Pricing [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidity Discount	20.00%	20.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives [Member] | BlackRock LTIP [Member] | Consensus Pricing [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquidity Discount	20.00%	20.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives [Member] | Visa Class B Swap [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Liabilities - Fair Value	$ 104	$ 135
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives [Member] | Visa Class B Swap [Member] | Discounted Cash Flow [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated conversion factor of Class B shares into Class A shares	164.30%	41.10%
Estimated growth rate of Visa Class A share price	16.30%	14.80%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives [Member] | Visa Class B Swap [Member] | Discounted Cash Flow [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated conversion factor of Class B shares into Class A shares	164.30%	41.10%
Estimated growth rate of Visa Class A share price	16.30%	14.80%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Derivatives [Member] | Visa Class B Swap [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated conversion factor of Class B shares into Class A shares	164.30%	41.10%
Estimated growth rate of Visa Class A share price	16.30%	14.80%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other borrowed funds [Member] | Non-Agency Securitization [Member] | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Liabilities - Fair Value		$ 166
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other borrowed funds [Member] | Non-Agency Securitization [Member] | Consensus Pricing [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread over the benchmark curve		1.13%
Credit and Liquidity discount		0.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other borrowed funds [Member] | Non-Agency Securitization [Member] | Consensus Pricing [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread over the benchmark curve		1.13%
Credit and Liquidity discount		99.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other borrowed funds [Member] | Non-Agency Securitization [Member] | Consensus Pricing [Member] | Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread over the benchmark curve		1.13%
Credit and Liquidity discount		18.00%
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Insignificant Assets, Net of Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 57	$ 23