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Fair Value (Fair Value Measurment - Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Mortgage servicing rights $ 1,105 $ 2,595 $ 2,519 $ 3,701 $ 3,774 $ 3,738
Retained Interest, Fair Value Disclosure 193   231      
Long-term debt 0   830      
Available-for-sale, Equity Investment in Any One Industry Did Not Exceed Percentage 22.00%   18.00%      
Fair Value, Measurements, Recurring [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 13,366   15,135      
Mortgage loans held-for-sale, net 1,377   3,919      
Consumer mortgage finance receivables and loans, net     835      
Mortgage servicing rights 1,105   2,519      
Retained Interest, Fair Value Disclosure 193   231      
Derivative Assets 4,874   5,701      
Securities Held as Collateral, at Fair Value 627   328      
Total assets 21,542   29,276      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (5,072)   (5,379)      
Trading Liabilities, Fair Value Disclosure     (61)      
Liabilities, Fair Value Disclosure (5,072)   (6,299)      
Fair Value, Measurements, Recurring [Member] | On-Balance Sheet Securitization Debt [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-term debt     (830)      
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (4,993)   (5,278)      
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (79)   (101)      
Fair Value, Measurements, Recurring [Member] | Loan repurchase liabilities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Accrued expenses and other liabilities     (29)      
Fair Value, Measurements, Recurring [Member] | Residential Mortgage Backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Trading securities     608      
Fair Value, Measurements, Recurring [Member] | Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 12,210   14,076      
Fair Value, Measurements, Recurring [Member] | US Treasury and Government [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 877   1,546      
Fair Value, Measurements, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities     1      
Fair Value, Measurements, Recurring [Member] | Foreign Government Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 849   784      
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 6,255   7,312      
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 2,533   2,615      
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 1,343   1,491      
Fair Value, Measurements, Recurring [Member] | Other Debt Obligations [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 353   327      
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 1,156   1,059      
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Assets 4,627   5,441      
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Assets 247   260      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 1,847   2,389      
Mortgage loans held-for-sale, net 0   0      
Consumer mortgage finance receivables and loans, net     0      
Mortgage servicing rights 0   0      
Retained Interest, Fair Value Disclosure 0   0      
Derivative Assets 28   79      
Securities Held as Collateral, at Fair Value 109   328      
Total assets 1,984   2,796      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (17)   (32)      
Trading Liabilities, Fair Value Disclosure     (61)      
Liabilities, Fair Value Disclosure (17)   (93)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | On-Balance Sheet Securitization Debt [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-term debt     0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (17)   (32)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Loan repurchase liabilities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Accrued expenses and other liabilities     0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential Mortgage Backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Trading securities     0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 691   1,330      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 201   903      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities     0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 490   427      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Debt Obligations [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 1,156   1,059      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Assets 28   79      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Assets 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 11,456   12,684      
Mortgage loans held-for-sale, net 1,377   3,889      
Consumer mortgage finance receivables and loans, net     0      
Mortgage servicing rights 0   0      
Retained Interest, Fair Value Disclosure 0   0      
Derivative Assets 4,717   5,516      
Securities Held as Collateral, at Fair Value 518   0      
Total assets 18,068   22,664      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (5,026)   (5,328)      
Trading Liabilities, Fair Value Disclosure     0      
Liabilities, Fair Value Disclosure (5,026)   (5,328)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | On-Balance Sheet Securitization Debt [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-term debt     0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (4,947)   (5,229)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (79)   (99)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loan repurchase liabilities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Accrued expenses and other liabilities     0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Trading securities     575      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 11,456   12,684      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 676   643      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities     1      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 359   357      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 6,255   7,312      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 2,470   2,553      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 1,343   1,491      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Debt Obligations [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 353   327      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Assets 4,477   5,274      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Assets 240   242      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 63   62      
Mortgage loans held-for-sale, net 0   30      
Consumer mortgage finance receivables and loans, net     835      
Mortgage servicing rights 1,105   2,519      
Retained Interest, Fair Value Disclosure 193   231      
Derivative Assets 129   106      
Securities Held as Collateral, at Fair Value 0   0      
Total assets 1,490   3,816      
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (29)   (19)      
Trading Liabilities, Fair Value Disclosure     0      
Liabilities, Fair Value Disclosure (29)   (878)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | On-Balance Sheet Securitization Debt [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-term debt     (830)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Financial Instruments, Liabilities, Fair Value Disclosure (29)   (17)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Financial Instruments, Liabilities, Fair Value Disclosure 0   (2)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Loan repurchase liabilities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Accrued expenses and other liabilities     (29)      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Mortgage Backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Trading securities     33      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 63   62      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury and Government [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities     0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 63   62      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Debt Obligations [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Total available-for-sale securities 0   0      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Assets 122   88      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]
            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Derivative Assets $ 7   $ 18