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Occupancy Expense And Information Systems And Communications Expense (Summary of Future Minimum Lease Payments Under Non-Cancelable Capital and Operating Leases) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Occupancy Expense And Information Systems And Communications Expense [Abstract]  
2012, Capital Leases $ 68
2013, Capital Leases 68
2014, Capital Leases 68
2015, Capital Leases 67
2016, Capital Leases 71
Thereafter, Capital Leases 647
Total minimum lease payments, Capital Leases 989
Less amount representing interest payments, Capital Leases (327)
Present value of minimum lease payments, Capital Leases 662
2012, Operating Leases 237
2013, Operating Leases 207
2014, Operating Leases 182
2015, Operating Leases 132
2016, Operating Leases 96
Thereafter, Operating Leases 275
Total minimum lease payments, Operating Leases 1,129
2012, Total 305
2013, Total 275
2014, Total 250
2015, Total 199
2016, Total 167
Thereafter, Total 922
Total minimum lease payments, Total $ 2,118