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Long-Term Debt Long-Term Debt (Composition of Long-term Debt portfolio) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Senior Notes $ 30,681 $ 43,050
Subordinated Debt 13,702 12,921
Variable Interest Entity Secured Debt 26,461 33,143
Derivative, Amount of Hedged Item 1,094 1,149
Long-term debt 74,561 92,885
Long-term debt guaranteed by the Federal Deposit Insurance Corporation 0 7,400
Long-term Debt, Fair Value 0 830
Fixed Income Interest Rate [Member]
   
Debt Instrument [Line Items]    
Senior Notes 28,336 39,657
Subordinated Debt 251 4,675
Variable Interest Entity Secured Debt 19,077 16,538
Trust preferred securities 2,623 2,622
Variable Income Interest Rate [Member]
   
Debt Instrument [Line Items]    
Senior Notes 2,345 3,393
Subordinated Debt 13,451 8,246
Variable Interest Entity Secured Debt 7,384 16,605
Senior Notes [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate 6.69% 6.15%
Subordinated Debt [Member]
   
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate 0.92% 4.62%
VIE secured debt [Domain]
   
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate 1.36% 1.96%
Trust Preferred Securities Subject to Mandatory Redemption [Member]
   
Debt Instrument [Line Items]    
Long-Term Debt Interest Rate 8.13% 8.13%
Long-term Debt, Weighted Average Interest Rate 8.13% 8.13%
Secured Debt [Member]
   
Debt Instrument [Line Items]    
Senior Notes 0 4,000
Subordinated Debt 13,500 12,700
Derivative, Amount of Hedged Item 0 0
Long-term debt 40,911 49,800
Revolving secured funding facilities [Member]
   
Debt Instrument [Line Items]    
Subordinated Debt $ 13,500 $ 8,200
Minimum [Member] | Senior Notes [Member]
   
Debt Instrument [Line Items]    
Long-Term Debt Interest Rate 0.38% 0.00%
Minimum [Member] | Subordinated Debt [Member]
   
Debt Instrument [Line Items]    
Long-Term Debt Interest Rate 0.65% 0.76%
Minimum [Member] | VIE secured debt [Domain]
   
Debt Instrument [Line Items]    
Long-Term Debt Interest Rate 0.25% 0.32%
Maximum [Member] | Senior Notes [Member]
   
Debt Instrument [Line Items]    
Long-Term Debt Interest Rate 10.29% 16.68%
Maximum [Member] | Subordinated Debt [Member]
   
Debt Instrument [Line Items]    
Long-Term Debt Interest Rate 8.00% 17.05%
Maximum [Member] | VIE secured debt [Domain]
   
Debt Instrument [Line Items]    
Long-Term Debt Interest Rate 8.30% 8.30%