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Supplemental Information About The Credit Quality Of Financing Receivables And Allowance For Losses On Financing Receivables (Real Estate) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Jun. 30, 2011
Commercial Real Estate Portfolio Segment [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Impaired Financing Receivable with No Related Allowance [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Impaired Financing Receivable with No Related Allowance [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Impaired Financing Receivable with Related Allowance [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Impaired Financing Receivable with Related Allowance [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
TDR Modifications [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Loan To Value Ratio Less Than 80 Percent [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Loan To Value Ratio Less Than 80 Percent [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Loan To Value Ratio From 80 To 95 Percent [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Loan To Value Ratio From 80 To 95 Percent [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Loan To Value Ratio Greater Than 95 Percent [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Loan To Value Ratio Greater Than 95 Percent [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Impaired Financing Receivable with No Related Allowance [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Impaired Financing Receivable with No Related Allowance [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Impaired Financing Receivable with Related Allowance [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Debt Real Estate [Member]
Impaired Financing Receivable with Related Allowance [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Secured Credit Quality Indicator Low Risk [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Secured Credit Quality Indicator Low Risk [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Secured Credit Quality Indicator Moderate Risk [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Secured Credit Quality Indicator Moderate Risk [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Secured Credit Quality Indicator High Risk [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Secured Credit Quality Indicator High Risk [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Impaired Financing Receivable with No Related Allowance [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Impaired Financing Receivable with No Related Allowance [Member]
Jun. 30, 2012
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Impaired Financing Receivable with Related Allowance [Member]
Dec. 31, 2011
Commercial Real Estate Portfolio Segment [Member]
Business Properties Real Estate [Member]
Impaired Financing Receivable with Related Allowance [Member]
Financing Receivables And Allowance For Losses [Abstract]                                                                    
Loans and leases receivable, Gross $ 279,189 $ 295,037 $ 27,710   $ 32,749           $ 22,409 $ 24,501 $ 14,349 $ 14,454 $ 3,787 $ 4,593 $ 4,273 $ 5,454         $ 5,301 $ 8,248 $ 4,861 $ 7,628 $ 84 $ 110 $ 356 $ 510        
Non-impaired financing receivables     20,244   24,002                                                          
General reserves     226   267                                                          
Total impaired loans     7,466   8,747 3,748 3,790 3,718 4,957                   3,587 3,558 3,408 4,560                 161 232 310 397
Allowance for losses (specific reserves)     561   822     561 822                       475 717                     86 105
Past Due Financing Receivables [Abstract]                                                                    
Financing Receivable, Recorded Investment, Equal to Greater than 30 Days Past Due     2.80%   2.80%           2.30% 2.40%                     4.70% 3.90%                    
Financing Receivable, Recorded Investments, Equal to Greater than 90 Days Past Due     2.30%   2.50%           1.90% 2.30%                     4.30% 3.00%                    
Nonaccrual Financing Receivables [Abstract]                                                                    
Nonaccrual loans     5,380   6,949           4,900 6,351                     480 598                    
Amount of nonaccrual loans currently paying in accordance with contractual terms     4,581   6,061                                                          
Nonearning financing receivables     630   790           403 541                     227 249                    
Allowance for losses as a percent of nonaccrual financing receivables     14.60%   15.70%                                                          
Allowance for losses as a percent of nonearning financing receivables     124.90%   137.80%                                                          
Impaired Loans                                                                    
Total impaired loans     7,466   8,747 3,748 3,790 3,718 4,957                   3,587 3,558 3,408 4,560                 161 232 310 397
Unpaid principal balance           3,792 3,846 4,114 5,049                   3,631 3,614 3,804 4,652                 161 232 310 397
Allowance for losses (specific reserves)     561   822     561 822                       475 717                     86 105
Average investment during the period     8,151   9,678 3,830 3,783 4,321 5,895                   3,632 3,568 3,961 5,435                 198 215 360 460
Interest income recognized     183 206 399                                                          
Interest income recognized on a cash basis     129 201 339                                                          
Financing Receivable, Modifications, Recorded Investment     6,330   7,006         4,454                                                
Changes In Loans Modified As Troubled Debt Restructurings     2,269                                                              
Loans Modified As Troubled Debt Restructuring That Have Subsequently Experienced Payment Default     407                                                              
Credit Quality Indicators [Abstract]                                                                    
Loans and leases receivable, Gross $ 279,189 $ 295,037 $ 27,710   $ 32,749           $ 22,409 $ 24,501 $ 14,349 $ 14,454 $ 3,787 $ 4,593 $ 4,273 $ 5,454         $ 5,301 $ 8,248 $ 4,861 $ 7,628 $ 84 $ 110 $ 356 $ 510        
Loan To Value Ratio Of Real Estate Loans Paying In Accordance With Contractual Terms     95.00%