Occupancy Expense and Information Systems and Communications Expense (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 sqft	Dec. 31, 2012	Dec. 31, 2011
Communications, Information Technology and Occupancy [Abstract]
Total depreciation expense	$ 401	$ 407	$ 408
Leased Area, square feet	1,025,000
Non-cancelable capital leases Period	20 years
Non-cancelable lease maturity date	September 2023
Subleased building, square feet	129,000
Leased area of office building, square feet	362,000
Capital lease period	20 years
Capital lease maturity date	December 2028
Net book value of capital leases with the related liability recorded in long term debt	646	576
Interest expense related to capital lease obligations	40	42	43
Accumulated amortization of assets related to capital leases	369	313
Rental expense, net of sublease revenue	224	227	232
Sublease revenue	6	4	5
Future minimum sublease rental commitments for capital lease	59
Future minimum sublease rental commitments for operating lease	$ 14