Fair Value (Fair Value Measurements- Recurring Quantitative Information) (Details) (Fair Value, Measurements, Recurring [Member], Level 3 [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	$ 10,812	$ 10,988
Recurring Liabilities - Fair Value	578	376
Total Recurring Assets Net of Recurring Liabilities - Fair Value	10,234	10,612
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	5,711	6,107
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	5,013	5,363
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	698	744
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] | Constant Prepayment Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	1.00%	1.00%
Range (Maximum % or bps amount)	27.00%	30.00%
Weighted Average (% or bps amount)	5.00%	5.00%
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] | Constant Default Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	0.00%	0.00%
Range (Maximum % or bps amount)	22.00%	24.00%
Weighted Average (% or bps amount)	7.00%	7.00%
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] | Loss Severity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	6.00%	10.00%
Range (Maximum % or bps amount)	100.00%	95.00%
Weighted Average (% or bps amount)	51.00%	52.00%
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] | Spread Over The Benchmark Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted Average (% or bps amount)	2.67%	3.15%
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	672	708
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	642	677
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	30	31
Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Constant Prepayment Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	1.00%	1.00%
Range (Maximum % or bps amount)	11.00%	11.00%
Weighted Average (% or bps amount)	4.00%	3.00%
Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Constant Default Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	3.00%	1.00%
Range (Maximum % or bps amount)	19.00%	25.00%
Weighted Average (% or bps amount)	10.00%	9.00%
Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Loss Severity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	10.00%	10.00%
Range (Maximum % or bps amount)	100.00%	100.00%
Weighted Average (% or bps amount)	73.00%	70.00%
Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Spread Over The Benchmark Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted Average (% or bps amount)	3.58%	5.11%
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	130	130
Available-for-sale Securities [Member] | State and Municipal [Member] | Discounted Cash Flow [Member] | Spread Over The Benchmark Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	0.85%	1.00%
Range (Maximum % or bps amount)	2.40%	2.80%
Weighted Average (% or bps amount)	1.01%	1.19%
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	201	209
Available-for-sale Securities [Member] | State and Municipal [Member] | Consensus Pricing [Member] | Credit Liquidity Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	0.00%	0.00%
Range (Maximum % or bps amount)	30.00%	30.00%
Weighted Average (% or bps amount)	8.00%	8.00%
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	48	48
Available-for-sale Securities [Member] | Other Debt Securities [Member] | Consensus Pricing [Member] | Credit Liquidity Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	7.00%	7.00%
Range (Maximum % or bps amount)	95.00%	95.00%
Weighted Average (% or bps amount)	86.00%	86.00%
Financial Derivatives [Member] | Residential Mortgage Loans Commitments [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value		85
Financial Derivatives [Member] | Residential Mortgage Loans Commitments [Member] | Discounted Cash Flow [Member] | Probability Of Funding [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)		8.50%
Range (Maximum % or bps amount)		99.00%
Weighted Average (% or bps amount)		71.10%
Financial Derivatives [Member] | Residential Mortgage Loans Commitments [Member] | Discounted Cash Flow [Member] | Embedded Servicing Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)		0.50%
Range (Maximum % or bps amount)		1.20%
Weighted Average (% or bps amount)		0.90%
Financial Derivatives [Member] | Commercial Mortgage Loans Commitments [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	37
Financial Derivatives [Member] | Commercial Mortgage Loans Commitments [Member] | Discounted Cash Flow [Member] | Spread Over The Benchmark Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	0.80%
Range (Maximum % or bps amount)	5.00%
Weighted Average (% or bps amount)	1.53%
Financial Derivatives [Member] | Commercial Mortgage Loans Commitments [Member] | Discounted Cash Flow [Member] | Embedded Servicing Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	0.80%
Range (Maximum % or bps amount)	3.00%
Weighted Average (% or bps amount)	1.10%
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	270	243
Financial Derivatives [Member] | BlackRock LTIP [Member] | Consensus Pricing [Member] | Liquidity Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	20.00%	22.50%
Range (Maximum % or bps amount)	20.00%	22.50%
Weighted Average (% or bps amount)	20.00%	22.50%
Financial Derivatives [Member] | Other Contracts [Member] | Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Liabilities - Fair Value		72
Financial Derivatives [Member] | Other Contracts [Member] | Discounted Cash Flow [Member] | Spread Over The Benchmark Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)		0.79%
Range (Maximum % or bps amount)		0.79%
Weighted Average (% or bps amount)		0.79%
Financial Derivatives [Member] | Other Contracts [Member] | Discounted Cash Flow [Member] | Credit Liquidity Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)		37.00%
Range (Maximum % or bps amount)		99.00%
Weighted Average (% or bps amount)		46.00%
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	61	43
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	61	43
Financial Derivatives [Member] | Visa Class B Swap [Member] | Discounted Cash Flow [Member] | Estimated Conversion Factor Visa Class Shares [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	41.50%	41.50%
Range (Maximum % or bps amount)	41.50%	41.50%
Weighted Average (% or bps amount)	41.50%	41.50%
Financial Derivatives [Member] | Visa Class B Swap [Member] | Discounted Cash Flow [Member] | Estimated Growth Rate Of Visa Class Share Price [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	7.60%	12.60%
Range (Maximum % or bps amount)	7.60%	12.60%
Weighted Average (% or bps amount)	7.60%	12.60%
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	32
Trading Securities - Debt [Member] | Consensus Pricing [Member] | Credit Liquidity Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	0.00%	8.00%
Range (Maximum % or bps amount)	20.00%	20.00%
Weighted Average (% or bps amount)	8.30%	12.00%
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	975	650
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Constant Prepayment Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	3.80%	3.90%
Range (Maximum % or bps amount)	48.70%	57.30%
Weighted Average (% or bps amount)	10.10%	18.80%
Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Spread Over The Benchmark Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	9.39%	9.39%
Range (Maximum % or bps amount)	19.18%	19.29%
Weighted Average (% or bps amount)	10.96%	11.15%
Loans Held For Sale [Member] | Residential Mortgage [Member] | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	30	27
Loans Held For Sale [Member] | Residential Mortgage [Member] | Consensus Pricing [Member] | Loss Severity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	0.00%	0.00%
Range (Maximum % or bps amount)	86.70%	92.70%
Weighted Average (% or bps amount)	47.90%	55.80%
Loans Held For Sale [Member] | Residential Mortgage [Member] | Consensus Pricing [Member] | Cumulative Default Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	2.60%	2.60%
Range (Maximum % or bps amount)	100.00%	100.00%
Weighted Average (% or bps amount)	6.80%	76.10%
Loans Held For Sale [Member] | Residential Mortgage [Member] | Consensus Pricing [Member] | Gross Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	13.00%	14.00%
Range (Maximum % or bps amount)	14.00%	15.30%
Weighted Average (% or bps amount)	13.30%	14.90%
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	635	772
Loans Held For Sale [Member] | Commercial Mortgage [Member] | Discounted Cash Flow [Member] | Spread Over The Benchmark Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	4.60%	4.85%
Range (Maximum % or bps amount)	51.60%	41.55%
Weighted Average (% or bps amount)	9.47%	9.99%
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	1,115	1,171
Equity Investments [Member] | Direct Equity Investments [Member] | Multiple Of Adjusted Earnings [Member] | Multiple Of Earnings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum Amount)	4.5	4.5
Range (Maximum Amount)	9.5	10.0
Weighted Average (Amount)	7.1	7.1
Equity Investments [Member] | Indirect Equity Investments [Member] | Net Asset Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	623	642
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	270	243
Other Assets [Member] | BlackRock Series C Preferred Stock | Consensus Pricing [Member] | Liquidity Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	20.00%	22.50%
Range (Maximum % or bps amount)	20.00%	22.50%
Weighted Average (% or bps amount)	20.00%	22.50%
Insignificant Assets, Net of Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	(30)	12
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	178	127
Loans - Residential real estate [Member] | Consensus Pricing [Member] | Loss Severity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	0.00%	0.00%
Range (Maximum % or bps amount)	100.00%	99.40%
Weighted Average (% or bps amount)	52.90%	61.10%
Loans - Residential real estate [Member] | Consensus Pricing [Member] | Cumulative Default Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	2.60%	2.60%
Range (Maximum % or bps amount)	100.00%	100.00%
Weighted Average (% or bps amount)	85.70%	76.30%
Loans - Residential real estate [Member] | Consensus Pricing [Member] | Gross Discount Rate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	12.00%	12.00%
Range (Maximum % or bps amount)	12.00%	12.50%
Weighted Average (% or bps amount)	12.00%	12.20%
Loans - Home equity [Member] | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Assets - Fair Value	133	7
Loans - Home equity [Member] | Consensus Pricing [Member] | Credit Liquidity Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	37.00%	37.00%
Range (Maximum % or bps amount)	99.00%	97.00%
Weighted Average (% or bps amount)	69.00%	65.00%
Other borrowed funds [Member] | Consensus Pricing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Recurring Liabilities - Fair Value	$ 195
Other borrowed funds [Member] | Consensus Pricing [Member] | Spread Over The Benchmark Curve [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	0.58%
Range (Maximum % or bps amount)	0.58%
Weighted Average (% or bps amount)	0.58%
Other borrowed funds [Member] | Consensus Pricing [Member] | Credit Liquidity Discount [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Minimum % or bps amount)	0.00%
Range (Maximum % or bps amount)	99.00%
Weighted Average (% or bps amount)	43.00%