Derivatives and Hedging Derivatives gains (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	$ 10,000,000		$ 9,000,000		$ (13,000,000)		$ (9,000,000)
Derivatives accounted for as hedges [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	15,000,000		0		7,000,000		(29,000,000)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	2,000,000		14,000,000		(20,000,000)		2,000,000
Derivatives accounted for as hedges [Member] | Cash Flow Hedging [Member] | Compensation and Benefits [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	5,000,000		(18,000,000)		16,000,000		(14,000,000)
Derivatives accounted for as hedges [Member] | Cash Flow Hedging [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	10,000,000		19,000,000		(9,000,000)		(14,000,000)
Derivatives accounted for as hedges [Member] | Interest rate contracts [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	0	[1]	0	[1]	0		0
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	0	[2]	0	[2]	(1,000,000)	[2]	(1,000,000)	[2]
Derivatives accounted for as hedges [Member] | Interest rate contracts [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):					(1,000,000)		(1,000,000)
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) recognized in Accumulated Other Comprehensive Loss:	15,000,000	[3]	0	[3]	7,000,000		(29,000,000)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	2,000,000	[4]	14,000,000	[4]	(19,000,000)	[4]	3,000,000	[4]
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Cash Flow Hedging [Member] | Compensation and Benefits [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	0		(3,000,000)		(2,000,000)		(4,000,000)
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Cash Flow Hedging [Member] | Other General Expenses [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	0		(1,000,000)		0		(1,000,000)
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Cash Flow Hedging [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	5,000,000		18,000,000		(12,000,000)		8,000,000
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss)
Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion):	(3,000,000)				(5,000,000)
Derivatives accounted for as hedges [Member] | Foreign exchange contracts [Member] | Fair value hedges
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	0	[5],[6]	0	[5],[6]	0	[5],[6]	(1,000,000)	[5],[6]
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	$ 0	[6]	$ 0	[6]	$ 0	[5],[6]	$ 1,000,000	[5],[6]

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

[2] Included within Interest Expense ($1 million loss for the six months ended June 30, 2014 and 2013 respectively).

[3] Location of future reclassification from Accumulated Other Comprehensive Loss will be included within Compensation and benefits ($5 million gain and $18 million loss for the three months ended June 30, 2014 and 2013, respectively, and $16 million gain and $14 million loss for the six months ended June 30, 2014 and 2013, respectively), and Other (expense) income ($10 million and $19 million gain for the three months ended June 30, 2014 and 2013, respectively, and $9 million and $14 million loss for the six months ended June 30, 2014 and 2013, respectively)

[4] Included within Compensation and benefits (no loss and $3 million loss for the three months ended June 30, 2014 and 2013, respectively, and $2 million and $4 million loss for the six months ended June 30, 2014 and 2013, respectively), Other general expenses (no loss and $1 million loss for the three months ended June 30, 2014 and 2013, respectively, and no loss and $1 million loss for the six months ended June 30, 2014 and 2013, respectively), and Other (expense) income ($5 million and $18 million gain for the three months ended June 30, 2014 and 2013, respectively, and $12 million loss and $8 million gain for the six months ended June 30, 2014 and 2013, respectively), Interest expenses ($3 million and $5 million loss for the three months and six months ended June 30, 2014 respectively).

[5] Included in Interest expense

[6] Relates to fixed rate debt