Commitments, Guarantees and Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments, Guarantees and Contingent Liabilities
Total rent expense for all leases	$ 192	$ 243	$ 256
Capital leases, future minimum lease payments
2014	17
2015	7
2016	7
2017	2
2018	2
Thereafter	9
Total	44
Present value of minimum capital lease payments	38
Operating leases, future minimum lease payments
2014	145
2015	118
2016	90
2017	55
2018	36
Thereafter	89
Total	$ 533