Derivatives and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Total fair value of derivatives assets	$ 822	$ 701
Total fair value of derivatives liabilties	246	213
Risk Exposure Low [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets, net	460
Total derivative liabilities, net	0	0
Derivative [Line Items]
Total derivative assets, net	460
Total derivative liabilities, net	0	0
Individually Significant Counterparties [Member]
Derivatives, Fair Value [Line Items]
Total derivative assets, net	0	0
Total derivative liabilities, net	0	0
Derivative [Line Items]
Total derivative assets, net	0	0
Total derivative liabilities, net	0	0
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives assets	822	701
Cash collateral netting	(125)	(336)
Derivative asset and liability netting	(126)	(36)
Total derivative assets, net	571	329
Derivative [Line Items]
Total derivative assets, net	571	329
Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives assets	693	637
Other Assets [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives assets	129	64
Other Assets [Member] | Fair Value Hedging [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives assets	309	455
Other Assets [Member] | Fair Value Hedging [Member] | Total Return Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives assets	0	8
Other Assets [Member] | Net Investment Hedging [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives assets	384	174
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives liabilties	246	213
Cash collateral netting	(27)	0
Derivative asset and liability netting	(126)	(36)
Total derivative liabilities, net	93	177
Derivative [Line Items]
Total derivative liabilities, net	93	177
Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives liabilties	84	118
Other Liabilities [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives liabilties	162	95
Other Liabilities [Member] | Fair Value Hedging [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives liabilties	27	2
Other Liabilities [Member] | Fair Value Hedging [Member] | Total Return Swap [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives liabilties	0	0
Other Liabilities [Member] | Net Investment Hedging [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total fair value of derivatives liabilties	$ 57	$ 116