Derivatives and Hedging Schedule of amounts of derivative gains (losses) recognized in the Consolidated Financial Statements (Details) (Designated as Hedging Instrument [Member], USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Foreign Exchange Contract [Member] | Interest Expense [Member]
Derivative [Line Items]
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	$ (3,000,000)		$ 0		$ 0
Foreign Exchange Contract [Member] | Compensation and Benefits [Member]
Derivative [Line Items]
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	17,000,000		8,000,000		6,000,000
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(12,000,000)		(9,000,000)		(3,000,000)
Foreign Exchange Contract [Member] | Other General Expenses [Member]
Derivative [Line Items]
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	0		(19,000,000)		(34,000,000)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(9,000,000)		(16,000,000)		(25,000,000)
Foreign Exchange Contract [Member] | Other Income [Member]
Derivative [Line Items]
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	13,000,000		6,000,000		(14,000,000)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	14,000,000		(9,000,000)		(8,000,000)
Cash Flow Hedging [Member]
Derivative [Line Items]
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	(2,000,000)		(21,000,000)		(55,000,000)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(11,000,000)		(35,000,000)		(36,000,000)
Cash Flow Hedging [Member] | Interest rate contracts [Member]
Derivative [Line Items]
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	2,000,000	[1]	0	[1]	(1,000,000)	[1]
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(1,000,000)	[2]	(1,000,000)	[2]	0	[2]
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	(4,000,000)	[3]	(21,000,000)	[3]	(54,000,000)	[3]
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(10,000,000)	[4]	(34,000,000)	[4]	(36,000,000)	[4]
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	0		4,000,000		(2,000,000)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	$ 0		$ 0		$ 0

[1] Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Interest Expense

[2] Included within Interest Expense

[3] Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Compensation and benefits ($17 million loss for 2013, $8 million loss for 2012 and $6 million loss for 2011), Other general expenses (none for 2013, $19 million loss for 2012 and $34 million loss for 2011), and Other income ($13 million gain for 2013, $6 million gain for 2012 and $14 million loss for 2011) December 31,Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):2013 2012 2011Cash flow hedges: Interest rate contracts (1)$(1) $(1) $—Foreign exchange contracts (2)(10) (34) (36)Total(11) (35) (36)Foreign net investment hedges: Foreign exchange contracts$— $— $—

[4] Included within Compensation and benefits ($12 million loss for 2013, $9 million loss for 2012 and $3 million loss for 2011), Interest Expense ($3 million loss for 2013 and none for both 2012 and 2011), Other general expenses ($9 million loss for 2013, $16 million loss for 2012 and $25 million loss for 2011), and Other income ($14 million gain for 2013, $9 million loss for 2012 and $8 million loss for 2011)